#![allow(non_snake_case, unused_imports)]

use std::cmp::{min, max};
use std::collections::{BinaryHeap, Bound, HashMap, HashSet, VecDeque};
use std::hash::Hash;
use std::ops::RangeBounds;
use ac_library::{Additive, Min, Segtree};
use proconio::{input, marker::Usize1, marker::Chars};
use itertools::Itertools;

#[allow(unused_macros)]
macro_rules! d {
    ( $( $x:expr ),* $(,)? ) => {
        eprintln!(
            concat!( $( stringify!($x), "={:?} " ),* ),
            $( $x ),*
        );
    };
}

#[allow(dead_code)]
fn yn(b: bool) -> &'static str {
    if b { "Yes" } else { "No" }
}

fn main() {
    input! {
        H: usize,
        W: usize,
        A: Usize1, B: Usize1,
        R1: Usize1, C1: Usize1,
        R2: Usize1, C2: Usize1,
        P: Usize1, Q: Usize1,
    }

    let mut ans = usize::MAX;
    for r in R1..=R2 {
        for c in C1..=C2 {
            let a = A.abs_diff(r) + B.abs_diff(c);
            let b = P.abs_diff(r) + Q.abs_diff(c);
            let c = P.abs_diff(A) + Q.abs_diff(B);

            ans = ans.min(a+b+c);
        }
    }

    println!("{}", ans);
}