#include <iostream>
#include <iomanip>
using namespace std;

int main() {
	int N, H = 0, W = 0, ans[30][30] = {}, tmp = 0;
	cin >> N;
	for (int i = 0; i < N * N; ++i) {
		ans[H][W] = i + 1;
		if (tmp % 4 == 0) {
			if (W >= N - 1 || ans[H][W + 1] != 0) {
				++H;
				++tmp;
			}
			else ++W;
		}
		else if (tmp % 4 == 1) {
			if (H >= N - 1 || ans[H + 1][W] != 0) {
				--W;
				++tmp;
			}
			else ++H;
		}
		else if (tmp % 4 == 2) {
			if (W <= 0 || ans[H][W - 1] != 0) {
				--H;
				++tmp;
			}
			else --W;
		}
		else {
			if (H <= 0 || ans[H - 1][W] != 0) {
				++W;
				++tmp;
			}
			else --H;
		}
	}
	for (int i = 0; i < N; ++i) {
		for (int j = 0; j < N; ++j) cout << setw(3) << setfill('0') << ans[i][j] << ' ';
		cout << endl;
	}
}