/**
 * COMP 1711 (Fall 2005)
 *
 * Solution to Challenge Problem #3 (Nth Day of Christmas)
 * 
 * @author   Based on a solution by Patrick DeNiverville
 * @version  Oct-18-2005
 */

public class Problem03
{
    public static int nthDay(int N)
    {
        int ithDayTotal = 0;
        int grandTotal = 0;

        if(N <= 0)
        {
            return -1;
        } // if

        for(int i = 1; i <= N; i++)
        {
            ithDayTotal += i;
            grandTotal += ithDayTotal;
        } // for i

        return grandTotal;
    } // nthDay(int)

} // class Problem03