Square of Stars

using System;

public class Program
{
    public static void Main()
    {
        int n = int.Parse(Console.ReadLine());

            for (int i = 0; i < n; i++)
            {
                Console.Write("*");
            }
               Console.WriteLine();

             for (int i = 0; i < n - 2; i++)
            {
                Console.WriteLine("*{0}*", new string (' ', n - 2));
            }

            for (int i = 0; i < n; i++)
            {
                Console.Write("*");
            }


    }
}