using System;

public class Program

{

public static void Main(string[]args)                                                                                                               

{   

int i, j;

​

        for(i=1;i<=5;i++)  //for loop fo

            {

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

                    {

                        Console.Write(i);

                    }

                Console.Write("\n");    

            }

        Console.ReadLine();

    }

}