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