#include <iostream>
#include <cstdlib>
using namespace std;
//Simon Kovarovic
int main()
{
	int X;
	int Y = 1;
	cin >> X;

	for (int i = (((X*X)-X)/2)+X; i >= 1; i--)
	{
		cout << abs(Y) << " ";
		Y++;
		if (Y == X+1)
		{
			cout << "\n";
			Y = -(Y-2);
			X--;
		}
		else if (Y == 0)
		{
			cout << "\n";
			Y = -(Y-1); //bude vzdy Y = 1;
			X--;
		}
	}



// hezci alternativa, ale ma vice cyklu :)

	/*	for (int i = 1; i <= X; i++) {
			if (i % 2 == 0) {
				for (int j = (X-i+1); j >= 1; j--) {
					cout << j << " ";
				}
			}
			else {
				for (int j = 1; j <= (X-i+1); j++) {
					cout << j << " ";
				}
			}
			cout << "\n";
		}
	*/

}