很简单的规律,竟然想了半天,智商显然低,
#include<cstdio>
#include<iostream>
#include<vector>
#include<queue>
#include<algorithm>
#include<string>
#include<cstdlib>
#include<map>
#include<set>
#include<cmath>
#include<cstring>
#include<cctype>
#include<climits>
#include<memory>
#include<climits>
#include<cstdlib>
using namespace std;
#define LL long long
#define INT (1<<31)-1;
int main()
{
LL a,b;
int cas=0;
while(scanf("%lld%lld",&a,&b)!=EOF)
{
if(!a&&!b) break;
printf("Case %d: %lld\n",++cas,a*(a-1)*b*(b-1)/4);
}
return 0;
}