DNA Sequences 2

            int magicSum = int.Parse(Console.ReadLine());

            for (int i = 1; i <= 4; i++)
            {
                for (int j = 1; j <= 4; j++)
                {
                    for (int k = 1; k <= 4; k++)
                    {

                        string result = $"{i}{j}{k}";

                        result = result.Replace("1", "A").Replace("2", "C").Replace("3", "G").Replace("4", "T");

                        char endSymbol = (i + j + k >= magicSum) ? 'O' : 'X';

                        Console.Write($"{endSymbol}{result}{endSymbol} ");
                    }
                    Console.WriteLine();
                }
            }