using System;

public class Program

{

    public static void Main()

    {

        int n = int.Parse(Console.ReadLine());

        for( int i =1;i<=n;i++){

            for(int j =1;j<=n;j++){

                if((i!=1)&&i!=n&& (j!=1)&&(j!=n))

                {

                    Console.WriteLine(" ");

                }

                else

                {

                    Console.Write("*");

                }

                Console.WriteLine();

            }

        }           

    }

}