#include <iostream>
#include <vector>
#include <cstring>
#include <string>
#include <algorithm>
#include <iomanip>
using namespace std;

int b[30][30];
int dx[4] = { 1, 0, -1, 0 }, dy[4] = { 0, 1, 0, -1 };

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int N;
	cin >> N;

	int nx = 0, ny = 0, dir = 0;
	for(int i = 1; i <= N * N; i++) {
		b[ny][nx] = i;

		int nnx = nx + dx[dir], nny = ny + dy[dir];
		if(nnx < 0 || N <= nnx || nny < 0 || N <= nny || b[nny][nnx] != 0) {
			dir = (dir + 1) % 4;
		}
		nx += dx[dir];
		ny += dy[dir];
	}

	for(int i = 0; i < N; i++) {
		for(int j = 0; j < N; j++) {
			cout << setw(3) << setfill('0') << b[i][j] << " ";
		}
		cout << endl;
	}
}