#include <bits/stdc++.h> using namespace std; int main(){ int n, m; cin >> n >> m; int x1, y1, x2, y2; cin >> x1 >> y1 >> x2 >> y2; int ans1 = (x1 + y1 - 2) + (n - x2 + m - y2); int ans2 = (x2 + y2 - 2) + (n - x1 + m - y1); cout << min(ans1, ans2); return 0; }