题解 | #汽水瓶#
汽水瓶
http://www.nowcoder.com/practice/fe298c55694f4ed39e256170ff2c205f
def f(n):
if n == 0 or n == 1: return 0
if n >= 2: return f(n-2) + 1
while True:
try:
num = int(input().strip())
if num:
print(f(num))
except:
break
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