#include<iostream>
using namespace std;

int main()
{
	int n;
	cin >> n;

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