题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
#简单题目，怎么分到中等难度来了
import sys
data= sys.stdin.readlines()
n=int(data[0].strip("\n"))
# print(n)
k=0
for i in range(1,n+1):
if '7' in str(i) or i%7==0:
k=k+1
print(k)
