题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b?tpId=37&tqId=21278&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3Fdifficulty%3D3%26page%3D1%26pageSize%3D50%26search%3D%26tpId%3D37%26type%3D37&difficulty=3&judgeStatus=undefined&tags=&title=
n = int(input())
cnt = 0
for i in range(1, n+1):
if i % 7 == 0:
cnt += 1
elif '7' in str(i):
cnt += 1
print(cnt)
