fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut maze: Vec<Vec<usize>> = vec![vec![0; n]; n];
    let mut x: usize = 0;
    let mut y: usize = 0;
    for i in 1..=n*n {
        maze[y][x] = i;
        let at_top    = (y == 0 && x < n-1) || (y > 0 && x < n-1 && maze[y-1][x] > 0 && maze[y][x+1] == 0);
        let at_right  = !at_top && ((x == n-1 && y < n-1) || (x < n-1 && y < n-1 && maze[y][x+1] > 0 && maze[y+1][x] == 0));
        let at_bottom = !at_top && !at_right && ((y == n-1 && x > 0) || (y < n-1 && x > 0 && maze[y+1][x] > 0 && maze[y][x-1] == 0));
        let at_left   = !at_top && !at_right && !at_bottom && ((x == 0 && y > 1) || (x > 0 && y > 0 && maze[y][x-1] > 0 && maze[y-1][x] == 0));
        if at_top {
            x += 1;
        } else if at_right {
            y += 1;
        } else if at_bottom {
            x -= 1;
        } else if at_left {
            y -= 1;
        }
    }
    maze.iter().for_each(|line| {
        println!("{}", line.iter().map(|i| format!("{:03}", i)).collect::<Vec<String>>().join(" "));
    })
}