using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter in the number of rows");

            int rows = Convert.ToInt32(Console.ReadLine());

            int preSpace = 0;

            int spaces = rows;

            for (int i = 0; i <= rows; i++)

            { 

                Console.WriteLine("");

                for (int k = 0; k < rows;k++)

                {

                    Console.Write(" ");

                }

                for (int j = 0; j < (2*i-1); j++)

                {

                    if (i > 0 && j > 0)

                    {

                        if (i < rows - 1 && j < spaces - 1)

                        {

                            Console.Write(" ");

                        }

                        else

                        {

                            Console.Write("*");

                        }

                    }

                    else

                    {

                        Console.Write("*");

                    }

                }

                preSpace+=1;

                spaces-=2;

            }

​

​

            Console.ReadLine();

​

    }

}