using System;

public class Program

{

    public static void Main()

    {

        int num,x=1;

    Console.WriteLine("please enter number:");

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

     while (x<=num*num)

     {

    if(x<num || x%num==0 || x%(num)-1==0 || x>(num*num)-num || x%(num+1)==1 || x%(num-1)==1)

        {

    Console.Write("* ");

        }

         else

         {

        Console.Write("  ");

         }   

         if(x%num==0)

    Console.WriteLine( );

    x++;

     }

    }

}