#include<iostream>
#include<cstdio>
using namespace std;
int main(){
    long long n,m,i,ans;
    scanf("%lld",&i);
    for(int kase=1;kase<=i;kase++){
        scanf("%lld%lld",&n,&m);
        printf("Scenario #%d:\n",kase);
        printf("%lld\n\n",(n+m)*(m-n+1)/2);
    }
    return 0;
}