题解 | #挑7#

def isRelationship(n):
    if n%7 == 0:
        return True
    s = str(n)
    if "7" in s:
        return True
    return False

while True:
    try:
        N = int(input())
        count = 0
        for i in range(1, N+1):
            if isRelationship(i):
                count += 1
        print(count)
    except:
        break