#include <iostream>
using namespace std;

int main()
{
    int Tn = 0;
    
    for ( int i = 1; i <= 15; i++ ) {
        Tn += i;
        cout << i << ", " << Tn << "\n";
    }
    
    cout << "\n\n"; system( "PAUSE" );
    return( 0 );
}