poj2924

#include

using namespace std;

int main(){

    int num,i=1;

cin>>num;

while(num--){

__int64 n,m;

cin>>n>>m;

__int64 sum=(n+m)*(m-n+1)/2;

cout<<"Scenario#"<<i++<<':'<<endl<<sum<<endl<<endl;

}

return 0;

}