botanics

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Numerics;

namespace Q10302
{
    class Program
    {
        static private int _n; static private bool ntof; static private BigInteger sum;
        static void Main(string[] args)
        {         
            for (; ; )
            {
            labeln: Console.Write("n>>>");
                ntof = int.TryParse(Console.ReadLine(), out _n);
                if (!ntof) goto labeln;
                sum = 0;
                for (int i = 1; i <= _n; i++)
                {
                    BigInteger temp = 1;
                    for (int j = 0; j < 3; j++)
                        temp *= i;
                    sum += temp;
                }
                Console.WriteLine("Ans={0}", sum);
            }
        }
    }
}