Serenje weather in April

In April, Serenje sees average daytime highs of 24°C and overnight lows near 15°C, with 36 mm of rain across 9 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 33% of the time in April, and the air most often feels humid.

Daylight stretches from about 11 h 54 min at the start of April to 11 h 30 min by month's end. Set against the rest of the year, April is Serenje's 7th-clearest and 6th-windiest month. For the whole year in context, see Serenje's year-round climate.

Daytime high: 24°; 9th warmest
Overnight low: 15°; 6th coldest
Rainfall: 36 mm; 9 wet days
Daylight: 11 h 42 min; 6:08 AM – 5:50 PM
Cloud cover: 52%; 7th clearest
Wind: 12 km/h; 6th windiest
Solar energy: 5.33 kWh/m²
Travel score: 7.2; out of 10

Serenje is human settlement in Zambia.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← March Serenje year-round climate May →Best places to visit in April

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical April day in Serenje reaches about 24°C in the afternoon and slips back to 15°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 27°C. Set against its neighbours, April runs about 1°C cooler than March and about 1°C warmer than May.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	25	25	25	25	25	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24
Avg low (°C)	17	16	16	16	16	16	16	16	16	16	16	16	16	16	15	15	15	15	15	15	15	15	15	15	15	15	15	14	14	14

	Avg high (°C)	Avg low (°C)
1	25	17
2	25	16
3	25	16
4	25	16
5	25	16
6	24	16
7	24	16
8	24	16
9	24	16
10	24	16
11	24	16
12	24	16
13	24	16
14	24	16
15	24	15
16	24	15
17	24	15
18	24	15
19	24	15
20	24	15
21	24	15
22	24	15
23	24	15
24	24	15
25	24	15
26	24	15
27	24	15
28	24	14
29	24	14
30	24	14

Serenje weather by month

How April compares with the rest of the year at a glance. April is the 9th-warmest and 6th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	25° / 18°	271	27.8	12.7	3.8
Feb	25° / 18°	219	24	12.4	4.0
Mar	25° / 17°	172	22.6	12.1	4.8
Apr	24° / 15°	36	9	11.7	7.2
May	24° / 13°	5	1.2	11.4	8.9
Jun	22° / 11°	1	0.5	11.2	8.8
Jul	22° / 10°	2	0.7	11.3	8.7
Aug	25° / 12°	1	0.2	11.6	9.2
Sep	28° / 15°	2	0.5	11.9	8.1
Oct	30° / 18°	14	3	12.3	6.4
Nov	29° / 18°	95	13.2	12.6	5.2
Dec	26° / 18°	244	26.1	12.8	4.1

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 27% of April, with mostly cloudy or overcast conditions the remaining 40%. Skies tend to open up as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	45	46	47	48	48	47	48	49	49	50	52	52	54	56	58	60	62	64	66	67	69	71	72	73	74	75	75	77	77	77
Cloudier (%)	55	54	53	52	52	53	52	51	51	50	48	48	46	44	42	40	38	36	34	33	31	29	28	27	26	25	25	23	23	23

	Clearer (%)	Cloudier (%)
1	45	55
2	46	54
3	47	53
4	48	52
5	48	52
6	47	53
7	48	52
8	49	51
9	49	51
10	50	50
11	52	48
12	52	48
13	54	46
14	56	44
15	58	42
16	60	40
17	62	38
18	64	36
19	66	34
20	67	33
21	69	31
22	71	29
23	72	28
24	73	27
25	74	26
26	75	25
27	75	25
28	77	23
29	77	23
30	77	23

Chance of precipitation in April

Any precipitation

Serenje gets around 36 mm of rain over 9 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 55% on the wettest days. The odds ease toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	55	54	52	51	50	48	47	45	44	42	40	38	35	33	31	28	26	24	22	20	18	16	15	14	13	12	11	10	9	9

	Rain chance (%)
1	55
2	54
3	52
4	51
5	50
6	48
7	47
8	45
9	44
10	42
11	40
12	38
13	35
14	33
15	31
16	28
17	26
18	24
19	22
20	20
21	18
22	16
23	15
24	14
25	13
26	12
27	11
28	10
29	9
30	9

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

Most of April feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, April lands in the humid band about 40% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	4	4	5	5	6	7	8	8	10	11	12	13	14	15	16	17	18	19	21	23	24	26	28	30	32	34	36	39	41	44
Comfortable (%)	22	24	26	27	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	44	45	45	45	46	45	45	44	43	42
Humid (%)	63	62	60	60	57	56	55	54	52	50	49	48	46	44	42	40	38	36	34	32	30	28	26	24	22	20	18	17	15	14
Muggy (%)	11	10	9	8	8	7	6	6	5	5	4	4	3	3	3	2	2	2	2	1	1	1	1	1	1	0	0	0	0	0

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	4	22	63	11
2	4	24	62	10
3	5	26	60	9
4	5	27	60	8
5	6	29	57	8
6	7	30	56	7
7	8	31	55	6
8	8	32	54	6
9	10	33	52	5
10	11	34	50	5
11	12	35	49	4
12	13	36	48	4
13	14	37	46	3
14	15	38	44	3
15	16	39	42	3
16	17	40	40	2
17	18	41	38	2
18	19	42	36	2
19	21	43	34	2
20	23	44	32	1
21	24	44	30	1
22	26	45	28	1
23	28	45	26	1
24	30	45	24	1
25	32	46	22	1
26	34	45	20	0
27	36	45	18	0
28	39	44	17	0
29	41	43	15	0
30	44	42	14	0

Wind in April

Winds average 12 km/h in April.

Across April, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	11	11	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12
Feels	calm	calm	calm	calm	calm	calm	calm	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	11	calm
2	11	calm
3	12	calm
4	12	calm
5	12	calm
6	12	calm
7	12	calm
8	12	light breeze
9	12	light breeze
10	12	light breeze
11	12	light breeze
12	12	light breeze
13	12	light breeze
14	12	light breeze
15	12	light breeze
16	12	light breeze
17	12	light breeze
18	12	light breeze
19	12	light breeze
20	12	light breeze
21	12	light breeze
22	12	light breeze
23	12	light breeze
24	12	light breeze
25	12	light breeze
26	12	light breeze
27	12	light breeze
28	12	light breeze
29	12	light breeze
30	12	light breeze

Sunrise & sunset in April

DaylightNight

Daylight runs from about 11 h 54 min at the start of April to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over April. Sunrise moves from 6:07 AM to 6:10 AM, and sunset from 6:00 PM to 5:43 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	11.9	11.9	11.9	11.9	11.8	11.8	11.8	11.8	11.8	11.8	11.8	11.8	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.6	11.6	11.6	11.6	11.6	11.6	11.6	11.6	11.6	11.5
Sunrise (AM)	6:07	6:07	6:07	6:07	6:07	6:07	6:07	6:07	6:08	6:08	6:08	6:08	6:08	6:08	6:08	6:08	6:08	6:08	6:08	6:09	6:09	6:09	6:09	6:09	6:09	6:09	6:10	6:10	6:10	6:10
Sunset (PM)	6:00	6:00	5:59	5:58	5:58	5:57	5:56	5:56	5:55	5:54	5:54	5:53	5:52	5:52	5:51	5:50	5:50	5:49	5:49	5:48	5:47	5:47	5:46	5:46	5:45	5:45	5:44	5:44	5:43	5:43

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.9	6:07	6:00
2	11.9	6:07	6:00
3	11.9	6:07	5:59
4	11.9	6:07	5:58
5	11.8	6:07	5:58
6	11.8	6:07	5:57
7	11.8	6:07	5:56
8	11.8	6:07	5:56
9	11.8	6:08	5:55
10	11.8	6:08	5:54
11	11.8	6:08	5:54
12	11.8	6:08	5:53
13	11.7	6:08	5:52
14	11.7	6:08	5:52
15	11.7	6:08	5:51
16	11.7	6:08	5:50
17	11.7	6:08	5:50
18	11.7	6:08	5:49
19	11.7	6:08	5:49
20	11.7	6:09	5:48
21	11.6	6:09	5:47
22	11.6	6:09	5:47
23	11.6	6:09	5:46
24	11.6	6:09	5:46
25	11.6	6:09	5:45
26	11.6	6:09	5:45
27	11.6	6:10	5:44
28	11.6	6:10	5:44
29	11.6	6:10	5:43
30	11.5	6:10	5:43

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.33 kWh/m².

For context, solar energy here swings from a low near 4.84 kWh/m² to a high of 7.07 kWh/m² in October across the year — April's 5.33 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	5.3	5.3	5.3	5.3	5.3	5.2	5.2	5.2	5.2	5.2	5.2	5.3	5.3	5.3	5.3	5.3	5.3	5.4	5.4	5.4	5.4	5.4	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.3	Bright
2	5.3	Bright
3	5.3	Bright
4	5.3	Bright
5	5.3	Bright
6	5.2	Bright
7	5.2	Bright
8	5.2	Bright
9	5.2	Bright
10	5.2	Bright
11	5.2	Bright
12	5.3	Bright
13	5.3	Bright
14	5.3	Bright
15	5.3	Bright
16	5.3	Bright
17	5.3	Bright
18	5.4	Bright
19	5.4	Bright
20	5.4	Bright
21	5.4	Bright
22	5.4	Bright
23	5.5	Bright
24	5.5	Bright
25	5.5	Bright
26	5.5	Bright
27	5.5	Bright
28	5.5	Bright
29	5.5	Bright
30	5.5	Bright

Planning a trip in April

Hazard calendar for Serenje

In seasonPeak

None of Serenje's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Serenje's monsoon runs December–March, when most of the year's rain falls.

Monsoon

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is April a good time to visit Serenje?

Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.2

Sightseeing

6th-best month of the year

6.2

Beach & pool

6th-best month of the year

April is one of the better times to visit Serenje for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Serenje in April

From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In April, Serenje sees daytime highs around 24°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Serenje in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Serenje peaks around January 20 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 9 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	16	15	16	13	10	9	10	11	11	11	13	14
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	16	Extreme
Feb	15	Extreme
Mar	16	Extreme
Apr	13	Extreme
May	10	Extreme
Jun	9	Very high
Jul	10	Very high
Aug	11	Extreme
Sep	11	Extreme
Oct	11	Extreme
Nov	13	Extreme
Dec	14	Extreme

Air quality in Serenje in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.

Air quality in Serenje is worst in September — around 45 µg/m³ PM2.5 (poor), about 8.1× the cleanest month (May, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	8	9	7	6	6	8	18	44	45	23	11	7
Level	Good	Good	Good	Good	Good	Good	Moderate	Poor	Poor	Moderate	Good	Good

	PM2.5 (µg/m³)	Level
Jan	8	Good
Feb	9	Good
Mar	7	Good
Apr	6	Good
May	6	Good
Jun	8	Good
Jul	18	Moderate
Aug	44	Poor
Sep	45	Poor
Oct	23	Moderate
Nov	11	Good
Dec	7	Good

Location & terrain

Where is Serenje?

Serenje sits at 13.2°S, 30.2°E, 1,424 m above sea level, in Zambia. The nearest listed city is Mkushi, 101 km away.

Topography around Serenje

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Serenje.

Within 3 km, the terrain around Serenje has only modest variations in elevation — a maximum elevation change of 212 m around an average of 1,430 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 378 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,347 m.

The land around Serenje is covered by cropland (26%), shrubs (22%) and grassland (21%) within 3 km, trees (45%) and shrubs (24%) within 16 km, and trees (70%) within 80 km.

3 km

212 m

cropland 26%

16 km

378 m

trees 45%

80 km

1,347 m

trees 70%

treesshrubsgrasslandcroplandartificial surfaces

← March Serenje year-round climate May →Best places to visit in April

April weather nearby: Mkushi 101 km · Nyimba 160 km · Petauke 162 km · Mapalo 172 km · Ndola 176 km · Kapiri Mposhi 188 km · Luanshya 197 km · Sinda 198 km

Zambia travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / D / G; 230 V · 50 Hz
Prices: ≈ 30% of US; price level, 2025
GDP per capita: $1,318; 2025
Happiness: 4.1 / 10; World Happiness, 2025
Homicide rate: 5.2; per 100k, 2015
Road deaths: 20.5; per 100k/yr, 2019
Income group: Lower middle; World Bank
English: High; EF EPI 573
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Serenje (-13.2325°, 30.2352°, elevation 1,424 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	25	17
2	25	16
3	25	16
4	25	16
5	25	16
6	24	16
7	24	16
8	24	16
9	24	16
10	24	16
11	24	16
12	24	16
13	24	16
14	24	16
15	24	15
16	24	15
17	24	15
18	24	15
19	24	15
20	24	15
21	24	15
22	24	15
23	24	15
24	24	15
25	24	15
26	24	15
27	24	15
28	24	14
29	24	14
30	24	14

	Clearer (%)	Cloudier (%)
1	45	55
2	46	54
3	47	53
4	48	52
5	48	52
6	47	53
7	48	52
8	49	51
9	49	51
10	50	50
11	52	48
12	52	48
13	54	46
14	56	44
15	58	42
16	60	40
17	62	38
18	64	36
19	66	34
20	67	33
21	69	31
22	71	29
23	72	28
24	73	27
25	74	26
26	75	25
27	75	25
28	77	23
29	77	23
30	77	23

	Rain chance (%)
1	55
2	54
3	52
4	51
5	50
6	48
7	47
8	45
9	44
10	42
11	40
12	38
13	35
14	33
15	31
16	28
17	26
18	24
19	22
20	20
21	18
22	16
23	15
24	14
25	13
26	12
27	11
28	10
29	9
30	9

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	4	22	63	11
2	4	24	62	10
3	5	26	60	9
4	5	27	60	8
5	6	29	57	8
6	7	30	56	7
7	8	31	55	6
8	8	32	54	6
9	10	33	52	5
10	11	34	50	5
11	12	35	49	4
12	13	36	48	4
13	14	37	46	3
14	15	38	44	3
15	16	39	42	3
16	17	40	40	2
17	18	41	38	2
18	19	42	36	2
19	21	43	34	2
20	23	44	32	1
21	24	44	30	1
22	26	45	28	1
23	28	45	26	1
24	30	45	24	1
25	32	46	22	1
26	34	45	20	0
27	36	45	18	0
28	39	44	17	0
29	41	43	15	0
30	44	42	14	0

	Avg high (°C)	Avg low (°C)
1	25	17
2	25	16
3	25	16
4	25	16
5	25	16
6	24	16
7	24	16
8	24	16
9	24	16
10	24	16
11	24	16
12	24	16
13	24	16
14	24	16
15	24	15
16	24	15
17	24	15
18	24	15
19	24	15
20	24	15
21	24	15
22	24	15
23	24	15
24	24	15
25	24	15
26	24	15
27	24	15
28	24	14
29	24	14
30	24	14

	Clearer (%)	Cloudier (%)
1	45	55
2	46	54
3	47	53
4	48	52
5	48	52
6	47	53
7	48	52
8	49	51
9	49	51
10	50	50
11	52	48
12	52	48
13	54	46
14	56	44
15	58	42
16	60	40
17	62	38
18	64	36
19	66	34
20	67	33
21	69	31
22	71	29
23	72	28
24	73	27
25	74	26
26	75	25
27	75	25
28	77	23
29	77	23
30	77	23

	Rain chance (%)
1	55
2	54
3	52
4	51
5	50
6	48
7	47
8	45
9	44
10	42
11	40
12	38
13	35
14	33
15	31
16	28
17	26
18	24
19	22
20	20
21	18
22	16
23	15
24	14
25	13
26	12
27	11
28	10
29	9
30	9

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	4	22	63	11
2	4	24	62	10
3	5	26	60	9
4	5	27	60	8
5	6	29	57	8
6	7	30	56	7
7	8	31	55	6
8	8	32	54	6
9	10	33	52	5
10	11	34	50	5
11	12	35	49	4
12	13	36	48	4
13	14	37	46	3
14	15	38	44	3
15	16	39	42	3
16	17	40	40	2
17	18	41	38	2
18	19	42	36	2
19	21	43	34	2
20	23	44	32	1
21	24	44	30	1
22	26	45	28	1
23	28	45	26	1
24	30	45	24	1
25	32	46	22	1
26	34	45	20	0
27	36	45	18	0
28	39	44	17	0
29	41	43	15	0
30	44	42	14	0

	Avg high (°C)	Avg low (°C)
1	25	17
2	25	16
3	25	16
4	25	16
5	25	16
6	24	16
7	24	16
8	24	16
9	24	16
10	24	16
11	24	16
12	24	16
13	24	16
14	24	16
15	24	15
16	24	15
17	24	15
18	24	15
19	24	15
20	24	15
21	24	15
22	24	15
23	24	15
24	24	15
25	24	15
26	24	15
27	24	15
28	24	14
29	24	14
30	24	14

	Clearer (%)	Cloudier (%)
1	45	55
2	46	54
3	47	53
4	48	52
5	48	52
6	47	53
7	48	52
8	49	51
9	49	51
10	50	50
11	52	48
12	52	48
13	54	46
14	56	44
15	58	42
16	60	40
17	62	38
18	64	36
19	66	34
20	67	33
21	69	31
22	71	29
23	72	28
24	73	27
25	74	26
26	75	25
27	75	25
28	77	23
29	77	23
30	77	23

	Rain chance (%)
1	55
2	54
3	52
4	51
5	50
6	48
7	47
8	45
9	44
10	42
11	40
12	38
13	35
14	33
15	31
16	28
17	26
18	24
19	22
20	20
21	18
22	16
23	15
24	14
25	13
26	12
27	11
28	10
29	9
30	9

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	4	22	63	11
2	4	24	62	10
3	5	26	60	9
4	5	27	60	8
5	6	29	57	8
6	7	30	56	7
7	8	31	55	6
8	8	32	54	6
9	10	33	52	5
10	11	34	50	5
11	12	35	49	4
12	13	36	48	4
13	14	37	46	3
14	15	38	44	3
15	16	39	42	3
16	17	40	40	2
17	18	41	38	2
18	19	42	36	2
19	21	43	34	2
20	23	44	32	1
21	24	44	30	1
22	26	45	28	1
23	28	45	26	1
24	30	45	24	1
25	32	46	22	1
26	34	45	20	0
27	36	45	18	0
28	39	44	17	0
29	41	43	15	0
30	44	42	14	0