using System;

​

public class Program

{

    public static void Main()

    {

        int num=5;

        int count = 1, count2=0;

        while (count <= num) 

        {

            count=1;

            count2++;

             Console.WriteLine();

            while (count <= count2 )

            {

                Console.Write(count);

                count++;

            }

        }

    }

}