using System;

public class Program

{

    public static void Main()

    {

        Console.Write("how many rows:");

        int rows=int.Parse(Console.ReadLine());

    for (int i = 1; i <= rows; i++) 

        { 

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

            { 

                Console.Write("* "); 

            } 

            Console.WriteLine(); 

        } 

        for (int i = rows; i >= 1; i--) 

        { 

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

            { 

                Console.Write("* "); 

            } 

            Console.WriteLine(); 

        }

    }

    }