18 lines
370 B
Python
18 lines
370 B
Python
import sys
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sys.stdin = open('count.in', 'r')
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sys.stdout = open('count.out', 'w')
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m, n = list(map(int, input().split()))
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x = [[0 for i in range(31)] for j in range(31)]
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s = 0
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for i in range(31):
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x[1][i] = 1
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for i in range(2, m+1):
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for j in range(n+1):
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for k in range(j+1):
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x[i][j] += x[i-1][k]
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for i in range(n+1):
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s += x[m][i]
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print(s)
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