squareOfStars

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

namespace squareOfStars
{
    class squareOfStars
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            for (int i = 0; i <(n); i++)
            {
                string stars = new string('*', n);
                Console.WriteLine(stars);

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