Exam 8. Magic Car Numbers

using System;
using System.Globalization;
using System.Threading;

public class MagicCarNumbers
{
    public static void Main()
    {
        Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
        checked
        {
            int magicWeight = int.Parse(Console.ReadLine());

            int magicCarNums = 0;
            if (magicWeight >= 60)
            {
                char[] carLetters = { 'A', 'B', 'C', 'E', 'H', 'K', 'M', 'P', 'T', 'X' };
                int[] weightLetters = { 10, 20, 30, 50, 80, 110, 130, 160, 200, 240 };
                magicWeight -= 40;
                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++)
                            {
                                bool digitsIsMagic = (b == a && c == a && d == a) || (c == b && d == b)
                                    || (b == a && c == a) || (b == a && d == c) || (c == a && d == b)
                                    || (d == a && c == b);

                                if (digitsIsMagic)
                                {
                                    int sumDigits = a + b + c + d;
                                    for (int x = 0; x < carLetters.Length; x++)
                                    {
                                        for (int y = 0; y < carLetters.Length; y++)
                                        {
                                            int sumLetters = weightLetters[x] + weightLetters[y];
                                            if (sumDigits + sumLetters == magicWeight)
                                            {
                                                magicCarNums++;
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }

            Console.WriteLine(magicCarNums);
        }
    }
}