#include<stdio.h>
 
int main()
{
    int i,t;
    double C,F,a,b,c;
 
    scanf("%d",&t);
 
    for(i=1;i<=t;i++)
    {
        scanf("%lf%lf",&C,&F);
        a=1.8*C+32;
        b=a+F;
        c=(5*(b-32))/9;
        printf("Case %d: %.2lf\n",i,c);
    }
 
    return 0;
}