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