题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
n = int(input())
index = 0
for i in range(1,n+1):
if i % 7 == 0:
index += 1
continue
if "7" in str(i):
index += 1
continue
print(index)
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