// Om Namah Shivaya
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl
#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)
template<typename T>
void amin(T &a, T b) {
a = min(a, b);
}
template<typename T>
void amax(T &a, T b) {
a = max(a, b);
}
#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif
/*
refs:
https://github.com/nikolapesic2802/Programming-Practice/blob/master/Salesman/Salesman.cpp
*/
const int MOD = 1e9 + 7;
const int N = 5e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;
template<typename T>
struct segtree {
// https://codeforces.com/blog/entry/18051
/*=======================================================*/
struct data {
ll a;
};
data neutral = {-inf2};
data merge(data &left, data &right) {
data curr;
curr.a = max(left.a,right.a);
return curr;
}
void create(int i, T v) {
tr[i].a = v;
}
void modify(int i, T v) {
amax(tr[i].a, v);
}
/*=======================================================*/
int n;
vector<data> tr;
segtree() {
}
segtree(int siz) {
init(siz);
}
void init(int siz) {
n = siz;
tr.assign(2 * n, neutral);
}
void build(vector<T> &a, int siz) {
rep(i, siz) create(i + n, a[i]);
rev(i, n - 1, 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
}
void pupd(int i, T v) {
modify(i + n, v);
for (i = (i + n) >> 1; i; i >>= 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
}
data query(int l, int r) {
data resl = neutral, resr = neutral;
for (l += n, r += n; l <= r; l >>= 1, r >>= 1) {
if (l & 1) resl = merge(resl, tr[l++]);
if (!(r & 1)) resr = merge(tr[r--], resr);
}
return merge(resl, resr);
}
};
void solve(int test_case)
{
ll n,U,D,s; cin >> n >> U >> D >> s;
vector<array<ll,3>> a(n+5);
rep1(i,n) rep(j,3) cin >> a[i][j];
// sort(a.begin()+1, a.begin()+n+1);
a[0] = {0,s,0};
a[n+1] = {N-1,s,0};
vector<int> here[N];
rep1(i,n+1){
here[a[i][0]].pb(i);
}
vector<ll> dp(n+5,-inf2);
segtree<ll> st1(N), st2(N);
dp[0] = 0;
st1.pupd(s,s*D), st2.pupd(s,-s*U);
rep1(t,N-1){
trav(i,here[t]){
auto [t,x,add] = a[i];
ll v1 = st1.query(1,x).a - x*D + add;
ll v2 = st2.query(x,N-1).a + x*U + add;
dp[i] = max(v1,v2);
}
vector<array<ll,3>> order;
trav(i,here[t]){
order.pb({a[i][1],a[i][2],i});
}
sort(all(order));
ll mx = -inf2;
for(auto [pos,add,i] : order){
amax(dp[i], mx+add);
amax(mx, dp[i]-add);
mx += add;
}
reverse(all(order));
mx = -inf2;
for(auto [pos,add,i] : order){
amax(dp[i],mx+add);
amax(mx,dp[i]-add);
mx += add;
}
trav(i,here[t]){
auto [t,x,add] = a[i];
st1.pupd(x,dp[i]+x*D);
st2.pupd(x,dp[i]-x*U);
}
}
ll ans = dp[n+1];
cout << ans << endl;
}
int main()
{
fastio;
int t = 1;
// cin >> t;
rep1(i, t) {
solve(i);
}
return 0;
}
