using System;

public class Program

{

    public static void butterfly_pattern(int n)

    {

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

        {

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

            {

                Console.Write("* ");

            }

        Console.WriteLine();

        }

    }

​

    public static void Main()

    {

        Console.WriteLine("Hello World");

        butterfly_pattern(5);

    }

}