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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int h, w, sy, sx, ty, tx;
    cin >> h >> w;
    cin >> sy >> sx >> ty >> tx;
    sy--, sx--, ty--, tx--;
    int ans = 0;
    vector<pair<int,int>> dir = {{0, -1}, {-1, 0}, {0, 1}, {1, 0}};
    vector B(h, vector<bool>(w));
    auto dfs = [&](auto dfs, int y, int x, int py, int px) -> void {
        for(auto [ny, nx] : dir){
            ny += y, nx += x;
            if(ny == py && nx == px) continue;
            if(ny < 0 || nx < 0 || ny >= h || nx >= w) continue;
            if(B[ny][nx]) return;
        }
        if(y == ty && x == tx){
            ans++;
            return;
        }
        B[y][x] = true;
        for(auto [ny, nx] : dir){
            ny += y, nx += x;
            //cerr << y << " " << x << " " << ny << " " << nx << " " << py << " " << px << "\n";
            if(ny == py && nx == px) continue;
            if(ny < 0 || nx < 0 || ny >= h || nx >= w) continue;
            dfs(dfs, ny, nx, y, x);
        }
        B[y][x] = false;
    };
    dfs(dfs, sy, sx, -1, -1);
    cout << ans << '\n';
}