import java.util.*;

public class Main {
    private static Scanner sc = new Scanner(System.in);
    private static int[][] ary;
    public static void main(String[] args) throws Exception {
        int n = sc.nextInt();
        move(n);
        show(n);
    }
    
    public static void move(int n) {
        ary = new int[n][n];
        int x = 0;
        int y = 0;
        int[] dx = {0, 1, 0, -1};
        int[] dy = {1, 0, -1, 0};
        int d = 0;
        for (int i = 1;i <= n*n;i++) {
            ary[x][y] = i;
            int nx = x + dx[d];
            int ny = y + dy[d];
            if (nx < 0 || n <= nx || ny < 0 || n <= ny) {
                d = (d+1)%4;
                nx = x + dx[d];
                ny = y + dy[d];
            } else if (ary[nx][ny] > 0) {
                d = (d+1)%4;
                nx = x + dx[d];
                ny = y + dy[d];
            }
            x = nx;
            y = ny;
        }
    }
    
    public static void show(int n) {
        for (int i = 0;i < n;i++) {
            StringBuilder sb = new StringBuilder();
            for (int j = 0;j < n;j++) {
                sb.append(String.format("%03d", ary[i][j])).append(" ");
            }
            System.out.println(sb.substring(0, sb.length()-1));
        }
    }
}