题解 | 挑7

注意题干，结果是不包含0但包含n的

import sys

def check_7(s: int) -> bool:
    if s % 7 == 0:
        return True
    elif "7" in str(s):
        return True
    else:
        return False

for line in sys.stdin:
    a = int(line.strip())
    counter = 0
    for each in range(1, a+1):
        counter += check_7(each)
    print(counter)