#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int dist(int i, int j, int x, int y) {
    return abs(i - x) + abs(j - y);
}

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    int h, w;
    cin >> h >> w;
    int a, b;
    cin >> a >> b;
    int r1, c1, r2, c2;
    cin >> r1 >> c1 >> r2 >> c2;
    int p, q;
    cin >> p >> q;
    int d = 1 << 30;
    for (int i = r1; i <= r2; i++) {
        for (int j = c1; j <= c2; j++) {
            d = min(d, dist(a, b, i, j) + dist(i, j, p, q));
        }
    }
    cout << d + dist(a, b, p, q) << endl;
    return 0;
}