#include<iostream> #include<string> #include<vector> #include<algorithm> #include<bitset> #include<set> #include<map> #include<stack> #include<queue> #include<deque> #include<list> #include<iomanip> #include<cmath> #include<cstring> #include<functional> using namespace std; #define repr(i, a, b) for (int i = (int)(a); i < (int)(b); i++) #define rep(i, n) repr(i, 0, n) #define INF 2e9 #define MOD 1000000007 //#define MOD 998244353 #define LINF (long long)4e18 #define jck 3.141592 using ll = long long; using Pi = pair<int,int>; using Pl = pair<ll,ll>; int main(){ int r,c,sy,sx,gy,gx; cin >> r >> c >> sy >> sx >> gy >> gx; cout << abs(sy-gy)+abs(sx-gx) << endl; }