#include <iostream>
using namespace std;
//Jachym Bajgar
int main()
{
	int x;
	cout << "zadej liche cislo:";
	cin >> x;
	
	int row = 1; int col = 1; int i = 1;
	
	while (row <= 2*x-1) {
		if (col == i+1 && col <= x && i != row && i != 2*x-row) {
			i++;
		}
		if (col == 2*x-(i-1) && row != 1) {
			i--;
		}
		cout << i << " ";
		col ++;
		if (col == 2*x) {
			cout << "\n";
			row ++;
			col = 1;
		}
	}
}