using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

            Console.WriteLine("enter the input:");

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

            Console.WriteLine("Input is:"+n);

        string str=" ";

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

    {

        int totalColInRow=i>n?(2*n-i):i; //condition

        //int spaces=i>n?(i-n):(n-i);

                //spaces

        for(int k=1;k<=n-totalColInRow;k++) 

                    {

                        Console.Write(str);

                    }

                    for(int j=1;j<=totalColInRow;j++)   

                    {

                        Console.Write("*"+str);

                    }

        ////

                Console.WriteLine();    

    }

    }

}       

​