9 lines
127 B
Python
9 lines
127 B
Python
N = int(input())
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a = 0
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while (N%5+5*a)%3 != 0 :
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a+=1
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if N//5-a < 0:
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print(-1)
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else:
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print((N%5+5*a)//3 + (N//5-a)) |