uva -10783

#include<stdio.h>
int main()
{
    int t,a,b,i,j,sum;
    while(scanf("%d",&t)==1)
    {
          for(i=1;i<=t;i++)
          {

            scanf("%d%d",&a,&b);
            if( a%2==1 && b%2==1)

            {
                j=a+2;
                for(j=a+2;j<=b;j=j+2)
                {


                    sum=a+j;
                    a=sum;
                }
            }
            printf("Case %d: %d\n",i,sum);


         }
    }
    return 0;
}