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