#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>
using namespace std;

using std::cin;
using std::cout;

#define rep(i,n) for(int i = 0; i < (int)n; i++)
#define FOR(n) for(int i = 0; i < (int)n; i++)
#define repi(i,a,b) for(int i = (int)a; i < (int)b; i++)
#define all(x) x.begin(),x.end()
//#define mp make_pair
#define vi vector<int>
#define vvi vector<vi>
#define vvvi vector<vvi>
#define vvvvi vector<vvvi>
#define pii pair<int,int>
#define vpii vector<pair<int,int>>

template<typename T>
bool chmax(T &a, const T b) {if(a<b) {a=b; return true;} else {return false;}}
template<typename T>
bool chmin(T &a, const T b) {if(a>b) {a=b; return true;} else {return false;}}

using ll = long long;
using ld = long double;
using ull = unsigned long long;

const ll INF = numeric_limits<long long>::max() / 2;
const ld pi = 3.1415926535897932384626433832795028;
const ll mod = 998244353;
int dx[] = {1, 0, -1, 0, -1, -1, 1, 1};
int dy[] = {0, 1, 0, -1, -1, 1, -1, 1};

#define int long long

void solve() {
    // パス以外で隣接するのがダメ
    int h, w;
    cin >> h >> w;
    int sx, sy, gx, gy;
    cin >> sx >> sy >> gx >> gy;
    sx--;
    sy--;
    gx--;
    gy--;

    set<pii> st;
    int ans = 0;
    auto dfs = [&](int x, int y, int px, int py, auto self) -> void {
        rep(d, 4) {
            int nx = x + dx[d];
            int ny = y + dy[d];
            if(nx < 0 || nx >= h || ny < 0 || ny >= w) continue;
            if(nx == px && ny == py) continue;
            if(st.find(make_pair(nx, ny)) != st.end()) return;
        }
        if(x == gx && y == gy) {
            ans++;
            return;
        }
        st.emplace(x, y);
        rep(d, 4) {
            int nx = x + dx[d];
            int ny = y + dy[d];
            if(nx < 0 || nx >= h || ny < 0 || ny >= w) continue;
            if(nx == px && ny == py) continue;
            self(nx, ny, x, y, self);
        }
        st.erase(st.find(make_pair(x, y)));
    };
    dfs(sx, sy, -1, -1, dfs);

    cout << ans << endl;
}

signed main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    solve();
    return 0;
}