using System;

public class Program

{

    public static void Main(string[] args)

    {

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

        Console.WriteLine(new string('*',n));

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

        {

            Console.Write('*');

            Console.Write(new string(' ',n-2));

            Console.WriteLine('*');

        }

        Console.WriteLine(new string('*',n));

    }   

}