def Main():
n=int(input())
cs=1
while n>0:
print("Case {}: ".format(cs),end="")
print(n//2)
n=int(input())
cs+=1
if __name__=='__main__':
Main()
n=int(input())
cs=1
while n>0:
print("Case {}: ".format(cs),end="")
print(n//2)
n=int(input())
cs+=1
if __name__=='__main__':
Main()
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