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

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int H,W; cin >> H >> W;
    vector<vector<bool>> already(H,vector<bool>(W));
    int sx,sy,gx,gy; cin >> sx >> sy >> gx >> gy;
    sx--; sy--; gx--; gy--;

    int answer = 0;
    vector<pair<int,int>> dxy = {{-1,0},{0,1},{1,0},{0,-1}};
    auto dfs = [&](auto dfs,int x,int y,int bx,int by) -> void {
        for(auto [dx,dy] : dxy){
            int nx = x+dx,ny = y+dy;
            if(nx < 0 || ny < 0 || nx >= H || ny >= W) continue;
            if(bx == nx && by == ny) continue;
            if(already.at(nx).at(ny)) return;
        }
        if(x == gx && y == gy){answer++; return;}
        already.at(x).at(y) = true;
        for(auto [dx,dy] : dxy){
            int nx = x+dx,ny = y+dy;
            if(nx < 0 || ny < 0 || nx >= H || ny >= W) continue;
            if(already.at(nx).at(ny)) continue;
            dfs(dfs,nx,ny,x,y);
        }
        already.at(x).at(y) = false;
    };
    dfs(dfs,sx,sy,-1,-1);
    cout << answer << endl;
}