#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;
using vi = vector<int>;
using vl = vector<ll>;
#define pb push_back
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define all(v) (v).begin(), (v).end()
int n=7;

int main() {
    int h,w;
    cin >> h >> w;
    int x,y;
    cin >> x >> y;
    int a,b,c,d;
    cin >> a >> b >> c >> d;
    int s,t;
    cin >> s >> t;
    int ans=2e9;
    int p=abs(x-s)+abs(y-t);
    for(int i=a;i<=c;i++){
        for(int j=b;j<=d;j++){
            int sum=p;
            sum+=abs(x-i)+abs(y-j);
            sum+=abs(s-i)+abs(t-j);
            ans=min(ans,sum);
        }
    }
    cout << ans << "\n";
}