/*  This Code is Submitted by wywcgs for Problem 2312 on 2006-08-07 at 12:20:03 */ 
#include <cstdio>

typedef long long int64;

int main()
{
	int t, T;
	
	scanf("%d", &T);
	for(t = 0; t < T; t++) {
		int64 a, b; scanf("%lld %lld", &a, &b);
		printf("Scenario #%d:\n%lld\n\n", t+1, (a+b)*(b-a+1)/2);
	}

	return 0;
}