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