#include <iostream>

using namespace std;

int main()
{
  int n;
  cin >> n;
  if ( n % 2 != 0 )
  {
  for ( int i = 0 ; i < n ; i++ )
  {
    for ( int j = 0 ; j < n ; j++ )
    {
    if ( i == 0 || i == n - 1 || j == 0 || j == n-1  )
    {
      
      cout << "*";
    }
    else 
    {
      cout << " ";
    }
    }
    cout << endl;
  }
  }
  
    return 0;
}