using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter your number: ");

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

        int stopper = 0;

        string[] hexa = new string[3];

        while(stopper < 3)

        {

            for(int i = stopper; i < 3;i++)

            {

                switch(decimalNum%16)

                {

                    case 1:

                        hexa[stopper] = "1";

                        break;

                    case 2:

                        hexa[stopper] = "2";

                        break;

                    case 3:

                        hexa[stopper] = "3";

                        break;

                    case 4:

                        hexa[stopper] = "4";

                        break;

                    case 5:

                        hexa[stopper] = "5";

                        break;

                    case 6:

                        hexa[stopper] = "6";

                        break;

                    case 7:

                        hexa[stopper] = "7";

                        break;

                    case 8:

                        hexa[0] = "8";

                        break;  

                    case 9:

                        hexa[0] = "9";

                        break;

                    case 10:

                        hexa[0] = "A";

                        break;

                    case 11:

                        hexa[0] = "B";

                        break;

                    case 12:

                        hexa[0] = "C";

                        break;

                    case 13:

                        hexa[0] = "D";

                        break;

                    case 14:

                        hexa[0] = "E";

                        break;

                    case 15:

                        hexa[0] = "F";

                        break;  

                    default:

                        Console.WriteLine("Some kind of errow :/ ");

                        break;

                }

                decimalNum /= 16;

            }

            stopper++;

        }

    }

}