using System;

class Program
{
    static void Main(string[] args)
    {
        int number = int.Parse(Console.ReadLine());
        Console.WriteLine(new string('*', number));

        for (int i = 0; i < number - 2; i++)
        {
            Console.Write("*");
            for (int a = 0; a < number - 2; a++)
            {
                Console.Write(" ");
            }
            Console.WriteLine("*");
        }

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

    }
}