using System;

class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        Console.WriteLine("{0}",new string('*',n));
        for (int i = 0; i < n-2; i++)
        {
            Console.WriteLine("*{0}*",new string(' ',n-2));
        }
        Console.WriteLine("{0}", new string('*', n));

    }
}