using System;

public class Program

{

    public static void Main()

    {

    int rows;

​

   Console.Write("Enter the number of rows : ");

   rows= Convert.ToInt32(Console.ReadLine());    

   for(int i = 1;i <= rows; i++)

   {

    for(int x = 1;x <= i; x++)

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

    Console.Write("\n");

   }

    }

}