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

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

            cout <<" ";
            i ++;
        }




    return 0;
}