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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int H,W,A,B; cin >> H >> W >> A >> B,A--,B--;
    vector<vector<bool>> X(H,vector<bool>(W));
    {
        int x1,y1,x2,y2; cin >> x1 >> y1 >> x2 >> y2,x1--,y1--;
        for(int i=x1; i<x2; i++) for(int k=y1; k<y2; k++) X.at(i).at(k) = true;
    }
    int P,Q; cin >> P >> Q,P--,Q--;
    int answer = 1001001001;
    for(int i=0; i<H; i++) for(int k=0; k<W; k++) if(X.at(i).at(k)){
        int now = abs(P-A)+abs(Q-B)+abs(i-A)+abs(k-B)+abs(i-P)+abs(k-Q);
        answer = min(answer,now);
    }
    cout << answer << endl;
}