#include <iostream>
using namespace std;
int main()
{
    int i , n ;
    cin >> n;
    i = 0;
    while ( i < n )
    {

         int j = 0;
         while ( j < n )
         {
            if ( j == 0 || i == 0 || i == n - 1 || j == n - 1 )
            {
                cout <<"*";
            }

            else
           { 
             cout <<" ";
           }

           j ++;
         }

         i ++;
         cout <<'\n';
    }




    return 0;
}