using System;

public class Program

{

    public static void Main()

    {

        int[] arr = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

        int counter = 0;

        for(int a=0;a<arr.Length;a++)

            for(int b=0;b<arr.Length;b++)

                for(int c=0;c<arr.Length;c++)

                    for(int d=0;d<arr.Length;d++)

                        {

                        Console.WriteLine(a + "" + b + "" + c + "" + d);

                        counter++;

                        }

        Console.WriteLine("Total: " + counter);

    }

}