#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 || j == n - 1 )
             { 
                 cout << "*";
             }

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

                j ++;
        }


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

             return 0;
}