题解 | #汽水瓶#
汽水瓶
https://www.nowcoder.com/practice/fe298c55694f4ed39e256170ff2c205f
# 20241010
while True:
try:
n = int(input())
if n == 0:
break
elif 0 < n < 2:
print(0)
else:
print(n // 2)
except:
break
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