#include <iostream>
#include <cstdio>
#include <limits>
#include <cmath>

using namespace std;

long long upper_limit = pow(10, 18);

int main()
{
    int t;
    unsigned int a;
    long long b;

    numeric_limits<long long>::max();

    scanf("%d",&t);

    for(int i=1; i<=t; i++)
    {
        scanf("%d %lld",&a,&b);
        if(1<=a && b<=upper_limit)
            printf("Case %d: %lld\n",i,a*b);
    }

    return 0;
}