using System;

public class Program

{

    public static void Alidin(int n)

    {

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

        {

            for(int b = 1; b <= n - a; b++)

            {

                Console.Write(" ");

            }

            for(int b = 1; b <= a; b++)

            {

                Console.Write(" *");

            }

            Console.WriteLine();

        }

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

            {

                for(int b = 1; b <= a; b++)

                {

                    Console.Write(" ");

                }

                for(int b = 1; b <= n - a; b++)

                {

                    Console.Write(" *");

                }

                Console.WriteLine();

        }

    }

    public static void Main()

    {

        Alidin(7);

    }

}