题解 | #汽水瓶#
汽水瓶
https://www.nowcoder.com/practice/fe298c55694f4ed39e256170ff2c205f
import sys
for line in sys.stdin:
n = int(line)
if n == 0:
break
sum = 0
while n // 3 > 0:
sum += n // 3
n = n // 3 + n % 3
if n == 2:
sum += 1
print(sum)
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