uva 11984

#include<stdio.h>
int main()
{
    int t,i;
    double c,f,F,C;
    while(scanf("%d",&t)==1)
    {
        for(i=1;i<=t;i++)
        {
            scanf("%lf%lf",&c,&f);

            F=(c*9)/5+f;
            C=(F*5)/9;
            printf("Case %d: %.2lf\n",i,C);

        }

    }
    return 0;
}