SquareofStars

using System;

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

        for (int i = 1; i <=n-2; i++)
        {
            string stars1 ="*"+new string(' ', n - 2)+"*";
            Console.WriteLine(stars1);
        }
        stars = new string('*', n);
        Console.WriteLine(stars);
    }
}