using System;

public class Program

{

    public static void Main()

    {

         int i, j;

​

            Console.Write("\n\n");

            Console.Write("Display the pattern like right angle triangle which repeat a number in a row:\n");

            Console.Write("-------------------------------------------------------------------------------");

            Console.Write("\n\n");

​

            for (i = 1; i <= 4; i++)

            {

                for (j = 1; j <= i; j++)

                    Console.Write("{0}", i);

                Console.Write("\n");

            }

    }

}