Python题解 | #挑7#

while True:
    try:
        n = int(input())
        count = 0
        for i in range(1, n + 1):
            if i % 7 == 0:
                count += 1
            else:
                j = i
                while j:
                    if j % 10 == 7:
                        count += 1
                        break
                    else:
                        j //= 10
        print(count)


    except:
        break