using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter number");

        int num = Int32.Parse(Console.ReadLine());

        int counter = 1;

        int innerGap = 1;

        while (num > 0)

        {

            if (counter == 1) 

            {

                Console.WriteLine(new string(' ',num-1) + '*');         

            } else

            {

                Console.WriteLine(new string(' ',num-1)+ '*' + new string(' ', innerGap) + '*');

                innerGap +=2;

            }

            num--;

            counter++;

        }

    }

}