1 #include<iostream>
 2 using namespace std;
 3 int main(){
 4     long a,b,temp=1;
 5     while(cin>>a>>b){
 6         if(!a&&!b)
 7             break;
 8         long long sum=1;
 9         if(a<2||b<2){
10             cout<<"Case "<<temp++<<": 0"<<endl;
11             continue;
12         }
13         sum*=(a-1)*a;
14         sum*=(b-1)*b;
15         sum/=4;
16         cout<<"Case "<<temp++<<": "<<sum<<endl;;
17     }
18 }