#include <bits/stdc++.h>
using namespace std;
int main()
{
    int T;
    scanf("%d", &T);
    for (int i = 1; i <= T; ++i)
    {
        printf("Case #%d: ", i);
        double x, y;
        scanf("%lf%lf", &x, &y);
        int a = x * 100 + 0.5;
        int b = y * 100 + 0.5;
        if (b == 1 || b == 10 || b == 100 || b == 1000 || b == 10000)
        {
            if (a == 2 * b)
                printf("0.01\n");
            else
                printf("0.02\n");
        }
        else
            printf("0.01\n");
    }
    return 0;
}