#include <bits/stdc++.h>
using namespace std;
const int INF = 0x3fffffff;
template<class T> bool chmax(T& a, const T& b){ if(a < b){ a = b; return 1; } return 0; }
struct SegmentTree{
int n, cost;
vector<int> seg;
SegmentTree(int n, int cost): n(n), cost(cost), seg(n * 2, -INF){}
void set(int at, int val){
val += at * cost;
at += n;
seg[at] = val;
while(at /= 2) chmax(seg[at], val);
}
int get(int l, int r){
l += n; r += n;
int ans = -INF;
while(l < r){
if(l & 1) chmax(ans, seg[l++]);
if(r & 1) chmax(ans, seg[--r]);
l /= 2;
r /= 2;
}
return ans;
}
int down(int x){
return get(0, x + 1) - x * cost;
}
int up(int x){
return get(x, n) - x * cost;
}
};
int main(){
const int MAX = 500002;
int N, U, D, S;
cin >> N >> U >> D >> S;
vector<vector<array<int, 2>>> a(MAX);
for(int i = 0; i < N; i++){
int T, L, M;
cin >> T >> L >> M;
a[T].push_back({L, M});
}
SegmentTree up(MAX, -U), down(MAX, D);
up.set(S, 0);
down.set(S, 0);
for(auto& fairs : a) if(fairs.size()){
sort(fairs.begin(), fairs.end());
vector<int> dp_up(fairs.size()), dp_down;
for(int i = 0; i < fairs.size(); i++) dp_up[i] = max(down.down(fairs[i][0]), up.up(fairs[i][0]));
dp_down = dp_up;
dp_down[0] += fairs[0][1];
for(int i = 1; i < fairs.size(); i++){
chmax(dp_down[i], dp_down[i - 1] - D * (fairs[i][0] - fairs[i - 1][0]));
dp_down[i] += fairs[i][1];
}
dp_up.back() += fairs.back()[1];
for(int i = fairs.size() - 1; i--; ){
chmax(dp_up[i], dp_up[i + 1] - U * (fairs[i + 1][0] - fairs[i][0]));
dp_up[i] += fairs[i][1];
}
for(int i = 0; i < fairs.size(); i++){
up.set(fairs[i][0], max(dp_up[i], dp_down[i]));
down.set(fairs[i][0], max(dp_up[i], dp_down[i]));
}
}
cout << max(up.up(S), down.down(S)) << endl;
}
