题解 | 挑7
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
while True:
try:
n = int(input())
ans = 0
for i in range(1, n + 1):
if i % 7 == 0 or "7" in str(i):
ans += 1
print(ans)
except:
break
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