ACM 10790 - How Many Points of Intersection?

#include <stdio.h>

int main()
{
    long long n, m, total, caseNum = 0;
    while (scanf("%lld %lld", &n, &m) == 2)
    {
        if (n == 0 && m == 0) break;
        printf("Case %lld: %lld\n", ++caseNum, n * (n - 1)  * m * (m - 1) / 4);  
    }
    return 0;
}

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