#pragma GCC optimize ("O3")
#pragma GCC target ("avx2")
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define mid ((l+r) >> 1)
const int INF = 2e9, N = 5e5+1;
int n, u, d, s, mx[500500], t1[2002002], t2[2002002];
vector<array<int, 2>> v[500500];
void update(int t[], int id, int x, int node = 1, int l = 1, int r = N) {
if(id < l || r < id) return;
if(l == r) {
t[node] = max(t[node], x);
return;
}
if(id <= mid) update(t, id, x, node*2, l, mid);
else update(t, id, x, node*2+1, mid+1, r);
t[node] = max(t[node*2], t[node*2+1]);
}
int find(int t[], int nl, int nr, int node = 1, int l = 1, int r = N) {
if(nr < l || r < nl) return -INF;
if(nl <= l && r <= nr) return t[node];
int re = -INF;
if(nl <= mid) re = max(re, find(t, nl, nr, node*2, l, mid));
if(mid < nr) re = max(re, find(t, nl, nr, node*2+1, mid+1, r));
return re;
}
int main() {
cin.tie(0)->sync_with_stdio(0);
cin >> n >> u >> d >> s;
for(int i=1;i<=n;i++) {
int t, x, y; cin >> t >> x >> y;
v[t].push_back({x, y});
}
fill(t1, t1+4*N+1, -INF), fill(t2, t2+4*N+1, -INF);
fill(mx, mx+N+1, -INF);
update(t1, s, s*u), update(t2, s, -s*d);
for(int t=1;t<=N;t++) if(!v[t].empty()) {
sort(v[t].begin(), v[t].end());
for(auto [x, y] : v[t]) mx[x] = max(find(t1, 1, x-1) - x*u, x*d + find(t2, x+1, N)) + y;
for(auto [x, y] : v[t]) {
update(t1, x, x*u+mx[x]);
update(t2, x, mx[x]-x*d);
}
for(auto [x, y] : v[t]) {
auto k = find(t1, 1, x-1) - x*u + y;
mx[x] = max(mx[x], k), update(t1, x, x*u+k);
}
reverse(v[t].begin(), v[t].end());
for(auto [x, y] : v[t]) {
auto k = x*d + find(t2, x+1, N) + y;
mx[x] = max(mx[x], k), update(t2, x, k-x*d);
}
for(auto [x, y] : v[t]) {
update(t1, x, x*u+mx[x]);
update(t2, x, mx[x]-x*d);
}
}
int ans = 0;
for(int i=1;i<=N;i++) ans = max(ans, mx[i] - abs(i-s)*(i<s ? u:d));
cout << ans << "\n";
}
