using System;

public class Program

{

    public static void Main()

    {

        int i, j;

            int h = 20;

​

            for (i = 1; i <= h; i++)

            {

                for (j = 0; j < i; j++)

                    Console.Write("*");

                Console.Write("\n");

            }

    Console.WriteLine();

          for (i = 1; i <= h; i++)

            {

                for (j = h; j > i; j--)

                    Console.Write("*");

                Console.Write("\n");

            }

        Console.WriteLine();

    /*  for (i = 1; i <= h; i++)

            {

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

                {

                    if (j <= (h - i + 1))

                        Console.Write(' '); 

                    else

                    { Console.Write('*'); 

                Console.Write('\n'); }

            }

        Console.WriteLine();*/

        { for (i = 1; i <= h/2; i++)

            {

                for (j = 0; j < i; j++)

                    Console.Write("*");

                Console.Write("\n");

            }

          for (i = 1; i <= h/2; i++)

            {

                for (j = h/2; j > i; j--)

                    Console.Write("*");

                Console.Write("\n");

            }

        Console.WriteLine();

            }

        for (i = 1; i <= h/2; i++)

            {

                for (j = 1; j <= (h/2 + i); j++)

                {

                    if (j <= (h/2 - i + 1))

                        Console.Write(' '); 

                    else

                        Console.Write('*');  

                }

                Console.Write('\n'); 

            }

        Console.WriteLine();

        }

}