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

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

    int H,W; cin >> H >> W;
    int sx,sy; cin >> sx >> sy;
    int N; cin >> N;
    vector<pair<int,int>> XY(N+1);
    XY.at(0) = {sx,sy};

    vector<long long> dp(N+1);
    for(int i=1; i<=N; i++){
        int x,y,c; cin >> x >> y >> c;
        auto [bx,by] = XY.at(i-1);
        if(x == bx || y == by || (abs(x-bx) == abs(y-by))) dp.at(i) = max(dp.at(i),dp.at(i-1)+c);
        if(i >= 2) dp.at(i) = max(dp.at(i),dp.at(i-2)+c),dp.at(i-1) = max(dp.at(i-1),dp.at(i-2));
        XY.at(i) = {x,y};
    }

    cout << *max_element(dp.begin(),dp.end()) << endl;
}