#include<stdio.h>
int main()
{
    long long int t,a,b,n,i,j;
    scanf("%lld",&t);
    for(i=1;i<=t;i++)
    {
        n=0;
        scanf("%lld%lld",&a,&b);
        for(j=a;j<=b;j++)
        {
            if(j%2==0)
            continue;
            if(j%2==1)
            {
                n=n+j;
            }
        }
        printf("Case %lld: %lld\n",i,n);
    }
    return 0;
}