#include<stdio.h>
int main()
{
    int T,i,j,a,b,sum;
    scanf("%d",&T);
    j=1;
    while(T--)
    {
        sum=0;
        scanf("%d %d",&a,&b);
        for(i=a;i<=b;i++)
        {
            if(i%2!=0)
                sum=sum+i;
        }
        printf("Case %d: %d\n",j,sum);
        j++;
    }
    return 0;
}