using System;

public class Program

{

    public static void Main()

    {

        long sum = 0;

        long squared = 0;

        long result = 0;

        const int N = 100;

        sum = N * (N+1)/ 2;

        squared = (N * (N + 1) * (2 * N + 1)) / 6;

        result = sum * sum - squared;

        Console.WriteLine(result);

    }

}