SquareOfStars

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

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

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