#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for (ll i = a; i < b; i++)
using ll = long long;

int main(){
    int h, w, a, b, r1, c1, r2, c2, p, q;
    cin >> h >> w >> a >> b >> r1 >> c1 >> r2 >> c2 >> p >> q;
    ll inf = 1e9;
    ll ans = inf;
    if(r1 > r2) swap(r1, r2);
    if(c1 > c2) swap(c1, c2);
    rep(i, r1, r2 + 1) rep(j, c1, c2 + 1) {
        ll d = abs(a - i) + abs(b - j);
        d += abs(i - p) + abs(j - q);
        d += abs(a - p) + abs(b - q);
        ans = min(ans, d);
    }
    cout << ans << endl;
}