题解 | #汽水瓶#

简单模拟。

def solution(m):
    ans = 0
    while m > 2:
        tmp = m // 3
        ans += tmp
        m = m % 3 + tmp
    return ans + 1 if m == 2 else ans

while True:
    try:
        nums = []
        while True:
            n = int(input())
            if n != 0:
                nums.append(n)
            else:
                break
        for n in nums:
            print(solution(n))
    except:
        break