using System;

​

public class Program

{

    public static void Main(string[] args)

    {

        NumberPattern pattern = new NumberPattern();

        pattern.PrintPattern();

    }

}

​

public class NumberPattern

{

    public void PrintPattern()

    {

        for (int i = 1; i <= 5; i++)

        {

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

            {

                Console.Write(j);

            }

            Console.WriteLine();

        }

    }

}