#include<bits/stdc++.h>
using namespace std;
int main()
{
long long int a,b,i=1;
while(cin>>a>>b)
{
if(a==0 && b==0) break;
if(a==0 || b==0)
{
printf("Case %lld: 0\n",i);
continue ;
}
printf("Case %lld: %lld\n",i++,((a*b*(a-1)*(b-1))/4));
}
return 0;
}
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