03. Combinations

using System;

namespace Combinations
{
    class Program
    {
        static void Main(string[] args)
        {
            int num = int.Parse(Console.ReadLine());
            int counter = 0;

            for (x = 0; x <= num; x++)
            {
                for (y = 0; y <= num; y++)
                {
                    for (z = 0; z <= num; z++)
                    {
                        if (num == x + y + z)
                        {
                            counter++;
                        }
                    }
                }
            }
            Console.WriteLine(counter);
        }
    }
}