#include <bits/stdc++.h> using namespace std; using ll = long long; using ld = long double; using VI = vector<int>; using VL = vector<ll>; using VS = vector<string>; template<class T> using PQ = priority_queue<T, vector<T>, greater<T>>; #define FOR(i,a,n) for(int (i)=(a);(i)<(n);++(i)) #define eFOR(i,a,n) for(int (i)=(a);(i)<=(n);++(i)) #define rFOR(i,a,n) for(int (i)=(n)-1;(i)>=(a);--(i)) #define erFOR(i,a,n) for(int (i)=(n);(i)>=(a);--(i)) #define each(i, a) for(auto &i : a) #define SORT(i) sort((i).begin(),(i).end()) #define rSORT(i,a) sort((i).begin(),(i).end(),(a)) #define all(i) (i).begin(),(i).end() #define out(y,x) ((y) < 0 || h <= (y) || (x) < 0 || w <= (x)) #define line cout << "-----------------------------\n" #define ENDL(i,n) ((i) == (n) - 1 ? "\n" : " ") #define stop system("pause") constexpr ll INF = 1000000000; constexpr ll LLINF = 1LL << 60; constexpr ll mod = 1000000007; constexpr ll MOD = 998244353; constexpr ld eps = 1e-10; constexpr ld pi = 3.1415926535897932; template<class T>inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; }return false; } template<class T>inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; }return false; } inline void init() { cin.tie(nullptr); cout.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); } template<class T>inline istream& operator>>(istream& is, vector<T>& v) { for (auto& elemnt : v)is >> elemnt; return is; } template<class T>inline istream& operator>>(istream& is, deque<T>& v) { for (auto& elemnt : v)is >> elemnt; return is; } template<class T, class U>inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; } template<class T>inline vector<T> vec(size_t a) { return vector<T>(a); } template<class T>inline vector<T> defvec(T def, size_t a) { return vector<T>(a, def); } template<class T, class... Ts>inline auto vec(size_t a, Ts... ts) { return vector<decltype(vec<T>(ts...))>(a, vec<T>(ts...)); } template<class T, class... Ts>inline auto defvec(T def, size_t a, Ts... ts) { return vector<decltype(defvec<T>(def, ts...))>(a, defvec<T>(def, ts...)); } int main() { init(); int h, w; cin >> h >> w; int a, b, c, d; cin >> a >> b >> c >> d; cout << abs(a - c) + abs(b - d) << "\n"; }