23 lines
409 B
Python
23 lines
409 B
Python
# n = int(input())
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# l = list(map(int, input().split(' ')))
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#
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# s = sum(l)
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#
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# if s%3!=0:
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# print(0)
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# else:
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# if s==0:
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# c = l.count(0)
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# if c<2:
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# print(0)
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# else:
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# print(c-1)
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# else:
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# print(l.count(0)+1)
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def countZero(n, l=3):
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if l==1: return 1
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return sum([countZero(n-i, l-1) for i in range(1,n)])
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print(countZero(1000))
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