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