pblm1

#include<stdio.h>

    int main()
{
    int i,T,count=0,c=0;
    scanf("%d",&T);
    while(T--)
    {
        int a,b;
        scanf("%d %d",&a,&b);
        for(i=a;i<=b;i+=2)
        {
            count=count+i;

        }c++;
        printf("Case  %d:%d\n",c,count);

                count=0;

    }
    return 0;
}