Nested Loops - Lab (03. Combinations)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Combinations

{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int counter = 0;
            for (int a = 0; a <= n; a++)
            {
                for (int b = 0; b <= n; b++)
                {
                    for (int c = 0; c <= n; c++)
                    {
                        if (a + b + c == n)
                        {
                            counter += 1;
                        }
                    }
                }
            }
            Console.WriteLine(counter);
        }
    }
}