#include <iostream>
using namespace std;
int main() 
{
  int n;
  cin >> n;

  for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
      if (i == 0 || j == 0 || i == n-1 || j == n - 1 || i == j) {
        cout << "*";
      } else {
        cout << " ";
      }
    }
    cout << endl;
  }

  return 0;
}