uva 10783

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{

    int t,a,b,sum=0;
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    cin>>t;
    for(int i=1; i<=t; i++)
    {
        cin>>a>>b;

        for(int j=a; j<=b; j=j+2)
        {
            if(j%2==0)
                    j+=1;
            sum=sum+j;
        }
        cout<<"Case "<<i<<":"<<' '<<sum<<endl;
        sum=0;
    }
}