题解 | #汽水瓶#
汽水瓶
https://www.nowcoder.com/practice/fe298c55694f4ed39e256170ff2c205f
import sys
def return_num(n):
a = 0
while n >= 3:
a += n // 3 # 喝到的瓶数
n = n // 3 + n % 3 # 空瓶子
if n == 2:
a += 1
return a
while True:
n = input()
if n == '0':
break
n = int(n)
print(return_num(n))
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