#include <algorithm>
#include <cstdlib>
#include <ios>
#include <iostream>

using namespace std;
using ll = long long;

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

  int H, W, A, B, R1, C1, R2, C2, P, Q;
  cin >> H >> W >> A >> B >> R1 >> C1 >> R2 >> C2 >> P >> Q;

  int ans = 1 << 30;
  for (int i = R1; i <= R2; i++) for (int j = C1; j <= C2; j++) {
    ans = min(ans, abs(A - i) + abs(B - j) + abs(i - P) + abs(j - Q));
  }
  cout << ans + abs(A - P) + abs(B - Q) << '\n';
}