题解 | #汽水瓶#

def max_bottles(n):
    result = n // 3
    bottles = n // 3 + n % 3
    if bottles == 2:
        result += 1
    elif bottles < 2:
        result += 0
    else:
        result += max_bottles(bottles)
    return result
while True:
    try:
        n = int(input())
        if n == 0:
            break
        else:
            print(max_bottles(n))
    except:
        break

递归的思路进行解题