#if __has_include(<yoniha/all.h>)
#include <yoniha/all.h>
using namespace atcoder;
#else
#include <bits/stdc++.h>
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif
#endif
using namespace std;

#define int long long
#define all(x) (x).begin(), (x).end()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rrep(i, n) for(int i = (int)((n) - 1); i >= 0; i--)
template <typename T> bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template <typename T> bool chmin(T &a,const T &b){if(a>b){a=b;return true;}return false;}

// using mint = modint;

signed main(){
  int h, w, a, b, r1, c1, r2, c2, p, q;
  cin >> h >> w >> a >> b >> r1 >> c1 >> r2 >> c2 >> p >> q;
  int ans = 1ll << 60;
  for(int i = r1; i <= r2; i++) for(int j = c1; j <= c2; j++){
    chmin(ans, abs(a - i) + abs(b - j) + abs(i - p) + abs(j - q) + abs(a - p) + abs(b - q));
  }
  println("{}", ans);
}