#include <algorithm>
#include <bits/stdc++.h>
#include <iostream>
#include <random>
#include <utility>
#include <variant>
#include <vector>
using namespace std;
#ifndef LOCAL
#define cerr if(false) cerr
#endif
#define out( x ) #x << " = " << x << " "
#define endl "\n"
template<class T, class T2>
inline bool chkmax(T &x, const T2 &y) { return x < y ? x = y, 1 : 0; }
template<class T, class T2>
inline bool chkmin(T &x, const T2 &y) { return x > y ? x = y, 1 : 0; }
typedef long long ll;
#define int ll
const ll mod = 1e9 + 7;
const ll inf = 1e17;
const int MAX_N = 5e5 + 42;
const ll neutr = -inf;
struct SegmentTree {
std::vector<ll> tree;
void build(){
tree.assign(4 * MAX_N, neutr);
}
void set(int ind, ll val, int x = 1, int lx = 0, int rx = MAX_N) {
if(lx == rx){
chkmax(tree[x], val);
return;
}
int m = (lx + rx) >> 1;
if(ind <= m)
set(ind, val, 2*x, lx, m);
else
set(ind, val, 2*x + 1, m+1, rx);
tree[x] = std::max(tree[2*x], tree[2*x + 1]);
}
ll query(int l, int r, int x = 1, int lx = 0, int rx = MAX_N) {
if(l > rx || lx > r) return neutr;
if(l <= lx && rx <= r) return tree[x];
int m = (lx + rx) >> 1;
ll left = query(l, r, 2*x, lx, m);
ll right = query(l, r, 2*x + 1, m+1, rx);
return std::max(left, right);
}
};
SegmentTree segUp;
SegmentTree segDown;
std::vector< std::pair< int, std::pair< int, int > > > v;
signed main(){
#ifndef LOCAL
std::ios_base::sync_with_stdio(false);
std::cin.tie(NULL);
std::cout.tie(NULL);
#endif
int n, U, D, L;
std::cin >> n >> U >> D >> L;
for(int i = 1; i <= n; i++){
int t, l, c;
std::cin >> t >> l >> c;
v.push_back({t, {l, c}});
}
v.push_back({ -1, { L, 0 } });
v.push_back({ mod, { L, 0 } });
std::sort(v.begin(), v.end());
segUp.build();
segDown.build();
std::vector<ll> dp(MAX_N, neutr);
dp[L] = 0;
segUp.set(L, -L * U + dp[L]);
segDown.set(L, L * D + dp[L]);
for (int i = 1; i < (int)v.size(); ) {
int day = v[i].first;
int groupStart = i, groupEnd = i;
while(groupEnd < (int)v.size() && v[groupEnd].first == day)
groupEnd++;
int cnt = groupEnd - groupStart;
vector<int> pos(cnt);
vector<ll> base(cnt, neutr);
for (int j = 0; j < cnt; j++) {
pos[j] = v[groupStart + j].second.first;
ll cand1 = segUp.query(pos[j], MAX_N - 1) + pos[j] * U;
ll cand2 = segDown.query(0, pos[j]) - pos[j] * D;
base[j] = max(cand1, cand2);
}
vector<ll> bestVal = base;
for (int j = 1; j < cnt; j++) {
bestVal[j] = max(bestVal[j], bestVal[j-1] - D * (pos[j] - pos[j-1]));
}
for (int j = cnt - 2; j >= 0; j--) {
bestVal[j] = max(bestVal[j], bestVal[j+1] - U * (pos[j+1] - pos[j]));
}
for (int j = 0; j < cnt; j++){
int currPos = pos[j];
ll new_dp = bestVal[j] + v[groupStart + j].second.second;
chkmax(dp[currPos], new_dp);
segUp.set(currPos, -currPos * U + dp[currPos]);
segDown.set(currPos, currPos * D + dp[currPos]);
}
i = groupEnd;
}
std::cout << dp[L] << endl;
return 0;
}
