using System;

public class Program

{

    public static void Main()

    {

        int n;

        Console.WriteLine("nhap n");

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

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

        {       

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

            {

                if (i==1||j==1||j+i==n+1||i==j&&j+i==n-1)

                    Console.Write("*");

            else

Console.Write("  ");

            }

            Console.Write("\n");

        }

    }

}