using System;

public class Program

{

    public static void Main()

    {

        int i,j,rows;

​

   Console.Write("Input number of rows : ");

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

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

   {

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

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

    Console.Write("\n");

   }

    }

}