#include<bits/stdc++.h>
using namespace std;
int main()
{
int n, i, c = 0, j = 0;
while(cin >> n && n > 0)
{
j++;
int a[n], x = 0, y = 0;
for(i=0;i<n;i++)
{
cin >> a[i];
if(a[i] == 0)
x++;
else
y++;
}
c = y - x;
cout << "Case " << j << ": " << c << endl;
}
return 0;
}
using namespace std;
int main()
{
int n, i, c = 0, j = 0;
while(cin >> n && n > 0)
{
j++;
int a[n], x = 0, y = 0;
for(i=0;i<n;i++)
{
cin >> a[i];
if(a[i] == 0)
x++;
else
y++;
}
c = y - x;
cout << "Case " << j << ": " << c << endl;
}
return 0;
}
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