Exam 1. Print_Nine_Digit_Magic_Numbers

namespace _4.Nine_DigitMagicNumbers
{
    using System;

    public class MagicNumbers
    {
        public static void Main(string[] args)
        {
            checked
            {
                int sum = int.Parse(Console.ReadLine());
                int diff = int.Parse(Console.ReadLine());

                bool foundMagicNumber = false;
                int a, b, c, d, e, f, g, h, i;
                for (a = 1; a <= 7; a++)
                {
                    for (b = 1; b <= 7; b++)
                    {
                        for (c = 1; c <= 7; c++)
                        {
                            int firstNum = (a * 100) + (b * 10) + c;
                            for (d = 1; d <= 7; d++)
                            {
                                for (e = 1; e <= 7; e++)
                                {
                                    for (f = 1; f <= 7; f++)
                                    {
                                        int secondNum = (d * 100) + (e * 10) + f;
                                        if (secondNum - firstNum == diff)
                                        {
                                            for (g = 1; g <= 7; g++)
                                            {
                                                for (h = 1; h <= 7; h++)
                                                {
                                                    for (i = 1; i <= 7; i++)
                                                    {
                                                        int thirdNum = (g * 100) + (h * 10) + i;
                                                        int currentSum = a + b + c + d + e + f + g + h + i;
                                                        if (currentSum == sum && thirdNum - secondNum == diff)
                                                        {
                                                            foundMagicNumber = true;
                                                            Console.WriteLine("{0}{1}{2}", firstNum, secondNum, thirdNum);
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

                if (!foundMagicNumber)
                {
                    Console.WriteLine("No");
                }
            }
        }
    }
}