题解 | #挑7#

#1 Multiples of 7: % == 0
#2 Include 7: str(n) and search for 7

# Overlap of #1 and #2 can use or

n = int(input())
c = 0

for i in range(1, n+1):
    if '7' in str(i) or i % 7 == 0:
        c += 1
print(c)

用or来合并同时能被7整除以及含有7的情况