import sys
def test():
for line in sys.stdin:
n= line.strip()
num=int(n)
if num!=0:
a=num//2
print(a)
else:
return 0
test()
def test():
for line in sys.stdin:
n= line.strip()
num=int(n)
if num!=0:
a=num//2
print(a)
else:
return 0
test()