题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
n = int(input())
ccount = 0
for i in range(1,n+1):
if i % 7 == 0: #1 i是7的倍数
ccount += 1
elif str(i).count('7') > 0: #2 i中包含7
ccount += 1
print(ccount)
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