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

			
		}
		cout << endl;
	}
	return 0;
}