#include "bits/stdc++.h"
using namespace std;
const int maxn = 5e5 + 5;
int n, d, u, s;
long long f[maxn];
const long long inf = 4e18;
struct info {
int t, l, m;
bool operator<(const info &o) {
return t < o.t;
}
} a[maxn];
struct segment_tree {
int n;
vector<long long> tree;
segment_tree() {}
segment_tree(int n) : n(n), tree(n * 4 + 6, -inf) {}
void update(int ind, int l, int r, int pos, long long val) {
if(l == r) {
tree[ind] = max(tree[ind], val);
return;
}
int mid = (l + r) / 2;
if(pos <= mid) update(ind * 2, l, mid, pos, val);
else update(ind * 2 + 1, mid + 1, r, pos, val);
tree[ind] = max(tree[ind * 2], tree[ind * 2 + 1]);
}
long long get(int ind, int l, int r, int x, int y) {
if(l > y || r < x) return -inf;
if(x <= l and r <= y) return tree[ind];
int mid = (l + r) / 2;
return max(get(ind * 2, l, mid, x, y), get(ind * 2 + 1, mid + 1, r, x, y));
}
void update(int pos, long long val) {
update(1, 1, n, pos, val);
}
long long get(int x, int y) {
return get(1, 1, n, x, y);
}
} up, down;
void solve() {
cin >> n >> u >> d >> s;
for(int i = 1; i <= n; ++i) {
cin >> a[i].t >> a[i].l >> a[i].m;
}
up = segment_tree(maxn);
down = segment_tree(maxn);
sort(a + 1, a + n + 1);
down.update(s, -(s * u));
up.update(s, s * d);
long long ans = 0;
for(int i = 1; i <= n; ++i) {
long long cur_up = up.get(1, a[i].l - 1) - a[i].l * d + a[i].m;
long long cur_down = down.get(a[i].l + 1, maxn - 1) + a[i].l * u + a[i].m;
f[i] = max(cur_up, cur_down);
up.update(a[i].l, f[i] + 1ll * a[i].l * d);
down.update(a[i].l, f[i] - 1ll * a[i].l * u);
if(a[i].l >= s) {
ans = max(ans, f[i] - 1ll * (a[i].l - s) * u);
}
else {
ans = max(ans, f[i] - (s - a[i].l) * d);
}
// cerr << i << " " << f[i] << " " << cur_up << " " << cur_down << '\n';
}
cout << ans;
}
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
solve();
return 0;
}
