题解 | #汽水瓶#
汽水瓶
https://www.nowcoder.com/practice/fe298c55694f4ed39e256170ff2c205f
n = None
num1 = []
while n != 0:
n = int(input())
num = 0
if n != 0:
while n >= 3:
num = num + int(n / 3)
n = int(n / 3) + n % 3
if int(n) == 2:
num = num + 1
num1.append(num)
for i in num1:
print(i)
