use proconio::{input, marker::Usize1};

fn main() {
    input! {
        h: usize, w: usize,
        a: Usize1, b: Usize1,
        r1: Usize1, c1: Usize1,
        r2: usize, c2: usize,
        p: Usize1, q: Usize1,
    }

    let mut ans = usize::MAX;
    for i in r1..r2 {
        for j in c1..c2 {
            let cand = dist(a, b, i, j) + dist(i, j, p, q) + dist(p, q, a, b);
            ans = ans.min(cand);
        }
    }
    println!("{ans}");
}

fn dist(i0: usize, j0: usize, i1: usize, j1: usize) -> usize {
    i0.abs_diff(i1) + j0.abs_diff(j1)
}