using System;

public class Program

{

    public static void Main()

    {

        int n=0,m=0;

        Console.WriteLine("Enter N value :");

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

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

        {

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

            {

                if(i>n/2)

                    m=n-i;

                else

                    m=i;

                if(j<=m  || j>=(n+1)-m)

                    Console.Write("*");

                else

                    Console.Write(" ");

            }

            Console.WriteLine();

        }

    }

}