#include <bits/stdc++.h>
#include <atcoder/all>

using namespace std;
using ll = long long;
#define rep(i, s, t) for (ll i = s; i < (ll)(t); i++)
#define all(x) begin(x), end(x)
template <class T> bool chmin(T& x, T y) {
	return x > y ? (x = y, true) : false;
}
template <class T> bool chmax(T& x, T y) {
	return x < y ? (x = y, true) : false;
}

void solve() {
	int h, w;
	cin >> h >> w;
	int a, b;
	cin >> a >> b;
	a--, b--;
	int r1, c1, r2, c2;
	cin >> r1 >> c1 >> r2 >> c2;
	r1--, c1--;
	int p, q;
	cin >> p >> q;
	p--, q--;
	ll ans = 1e9;
	rep(r, r1, r2) rep(c, c1, c2) {
		chmin(ans, abs(a - r) + abs(b - c) + abs(r - p) + abs(c - q) +
					   abs(p - a) + abs(q - b));
	}
	cout << ans << '\n';
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout << fixed << setprecision(15);
	int t = 1;
	// cin >> t;
	while (t--) solve();
}