C# Exam April 2014 - Magic Car Number

using System;

class MagicCarNumber
{
    static void Main()
    {
        int[] carnum = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        int[] carlet = { 10, 20, 30, 50, 80, 110, 130, 160, 200, 240 }; //Letters  'A', 'B', 'C', 'E', 'H', 'K', 'M', 'P', 'T', 'X'
        int magicNum = int.Parse(Console.ReadLine());
        int magicNumCount = 0;

        for (int x = 0; x < 10; x++)
        {
            for (int y = 0; y < 10; y++)
            {
                  for (int a = 0; a < 10; a++)
                    {
                        for (int b = 0; b < 10; b++)
                        {
                            for (int c = 0; c < 10; c++)
                            {
                                for (int d = 0; d < 10; d++)
                                {
                                    if (carlet[x] + carlet[y] + carnum[a] + carnum[b] + carnum[c] + carnum[d] == magicNum - 40) // magicNum - 40 becouse aways first 2 letters are CA
                                    {
                                        if ((carnum[a] == carnum[b]) && (carnum[a] == carnum[c]) && (carnum[a] == carnum[d]))
                                        {
                                            magicNumCount++;
                                        }
                                        if ((carnum[a] != carnum[b]) && (carnum[b] == carnum[c]) && (carnum[b] == carnum[d]))
                                        {
                                            magicNumCount++;
                                        }
                                        if ((carnum[a] == carnum[b]) && (carnum[a] == carnum[c]) && (carnum[a] != carnum[d]))
                                        {
                                            magicNumCount++;
                                        }
                                        if ((carnum[a] == carnum[b]) && (carnum[a] != carnum[c]) && (carnum[c] == carnum[d]))
                                        {
                                            magicNumCount++;
                                        }
                                        if ((carnum[a] == carnum[c]) && (carnum[a] != carnum[b]) && (carnum[b] == carnum[d]))
                                        {
                                            magicNumCount++;
                                        }
                                        if ((carnum[a] == carnum[d]) && (carnum[a] != carnum[b]) && (carnum[b] == carnum[c]))
                                        {
                                            magicNumCount++;
                                        }
                                    }
                                }
                            }

                        }

                    }
                }
            }

        Console.WriteLine(magicNumCount);
    }

}