use std::io;
use std::io::prelude::*;

fn main() {
    let stdin = io::read_to_string(io::stdin()).unwrap();
    let mut stdin = stdin.split_whitespace();
    let stdout = io::stdout();
    let mut stdout = io::BufWriter::new(stdout.lock());

    let _: isize = stdin.next().unwrap().parse::<isize>().unwrap();
    let _: isize = stdin.next().unwrap().parse::<isize>().unwrap();
    let sy: isize = stdin.next().unwrap().parse::<isize>().unwrap();
    let sx: isize = stdin.next().unwrap().parse::<isize>().unwrap();
    let gy: isize = stdin.next().unwrap().parse::<isize>().unwrap();
    let gx: isize = stdin.next().unwrap().parse::<isize>().unwrap();
    writeln!(stdout, "{}", (sx - gx).abs() + (sy - gy).abs()).unwrap_or(());
}