Problem P_Sadaf Halim

#include <stdio.h>
int main()
{
    int T;
    scanf("%d", &T);
    long long int m,n,i; long long int multiplier,sum;
    for(i=0;i<T;i++)
    {
        scanf("%lld %lld", &n, &m);
        multiplier=n/(2*m);
        sum=m*m*multiplier;
        printf("Case %lld: %lld\n",i+1,sum);
    }
    return 0;
}