#include <bits/stdc++.h>
using namespace std;
int main()
{
int tc,cases=1,n,a[1001],give,given,egl;
while(cin>>n)
{
give=0,given=0;
if (n==0) break;
for(int i=0;i<n;i++)
cin>>a[i];
for(int i=0;i<n;i++)
if(a[i]==0) give++;
else given++;
egl=given-give;
cout<<"Case "<<cases++<<":"<<" "<<egl<<endl;
}
return 0;
}
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