题解 | #汽水瓶#
汽水瓶
https://www.nowcoder.com/practice/fe298c55694f4ed39e256170ff2c205f
flag = 1
list=[]
while flag:
count = 0
n = int(input())
if n != 0:
while n // 3 > 0:
count += n//3
n=n//3+n%3
if n==2:
count += 1
list.append(count)
else:
flag = 0
for i in list:
print(i)
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