#include<bits/stdc++.h>
#pragma GCC optimize("Ofast")
//#pragma GCC optimize("trapv")
#define st first
#define nd second
#define pb push_back
#define eb emplace_back
#define pp(x) pop_back(x)
#define mp(a, b) make_pair(a, b)
#define all(x) (x).begin(), (x).end()
#define rev(x) reverse(all(x))
#define sor(x) sort(all(x))
#define sz(x) (int)(x).size()
#define rsz(x) resize(x)
using namespace std;
///~~~~~~~~~~~~~~~~~~~~~~~~~~
template <typename H, typename T>
ostream& operator<<(ostream& os, pair<H, T> m){
return os <<"("<< m.st<<", "<<m.nd<<")";
}
template <typename H>
ostream& operator<<(ostream& os, vector<H> V){
os<<"{";
for(int i=0; i<V.size(); i++){
if(i)os<<", ";
os<<V[i];
}
os<<"}";
return os;
}
void debug(){cerr<<"\n";}
template <typename H, typename... T>
void debug(H h, T... t) {cerr<<h; if (sizeof...(t)) cerr << ", "; debug(t...);}
#define deb(x...) cerr<<#x<<" = ";debug(x);
//#define deb(x...) ;
///~~~~~~~~~~~~~~~~~~~~~~~~~
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii > vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef string str;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template <typename T>
using ordered_set =
tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define BOOST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const int K=19, N=1<<K, INF=1e9+5, mod2=1e9+7, mod=998244353;
struct modint{
int n=0;
modint(){}
modint(ll x){
n=x%mod;
if(n<0)n+=mod;
}
operator int(){
return n;
}
modint operator+(modint a){a.n = n+a.n; if(a.n>=mod)a.n-=mod;return a;}
modint operator+=(modint a){return (*this)=(*this)+a;}
modint operator-(modint a){a.n = n-a.n; if(a.n<0)a.n+=mod;return a;}
modint operator-=(modint a){return (*this)=(*this)-a;}
modint operator*(modint a){a.n = (n*1ll*a.n)%mod; return a;}
modint operator*=(modint a){return (*this)=(*this)*a;}
modint operator^(const ll &m)const{
modint a(1);
if(m==0)return a;
if(m==1)return (*this);
a=(*this)^(m/2);
a*=a;
return a*((*this)^(m&1));
}
modint odw(){
return (*this)^((ll)mod-2);
}
modint operator/(modint a){return (*this)*a.odw();}
modint operator/=(modint a){return (*this)=(*this)/a;}
bool operator==(modint a){return a.n==n;}
friend ostream& operator<<(ostream& os, modint m) {
return os << m.n;
}
};
modint fact[N], fact2[N];
typedef vector<modint> vm;
void factinit(){
fact[0]=1;
for(int i=1; i<N; i++){
fact[i]=(fact[i-1]*modint(i))%mod;
}
fact2[N-1]=fact[N-1].odw();
for(int i=N-2; i>=0; i--){
fact2[i]=(fact2[i+1]*modint(i+1))%mod;
}
}
modint npok(int _n, int _k){
if(_n<_k)return 0;
return fact[_n]*fact2[_k]*fact2[_n-_k];
}
int los(int a, int b){
return a+(rng())%(b-a+1);
}
int dp[N];
int tab[N+N], tab2[N+N];//gora, dol
void ust(int p, int c){
for(p+=N; p>0; p>>=1){
tab[p]=max(tab[p], c);
}
}
int get(int l, int r){
int ans=-1e9;
for(l+=N, r+=N; l<r; l>>=1, r>>=1){
if(l&1)ans=max(ans, tab[l++]);
if(r&1)ans=max(ans, tab[--r]);
}
return ans;
}
void ust2(int p, int c){
for(p+=N; p>0; p>>=1){
tab2[p]=max(tab2[p], c);
}
}
int get2(int l, int r){
int ans=-1e9;
for(l+=N, r+=N; l<r; l>>=1, r>>=1){
if(l&1)ans=max(ans, tab2[l++]);
if(r&1)ans=max(ans, tab2[--r]);
}
return ans;
}
int main(){
//factinit();
for(int i=0; i<N+N; i++)tab[i]=tab2[i]=-1e9;
int n, u, d, S;
cin>>n>>u>>d>>S;
vector<pair<int, pii> > V, V2;
for(int i=0; i<n; i++){
int t, l, w;
cin>>t>>l>>w;
V.eb(t, mp(l, w));
}
sor(V);
ust(S, -S*u);
ust2(S, S*d);
int pocz=0;
for(int i=0; i<n;i++){
V2.pb(V[i]);
if(i==n-1 || V[i+1].st!=V[i].st){
vi dol(V2.size()), gora(V2.size());
for(int j=0; j<V2.size(); j++){
dp[pocz+j]=-1e9;
gora[j]=get(V2[j].nd.st, N)+V2[j].nd.st*u;
dol[j]=get2(0, V2[j].nd.st+1)-V2[j].nd.st*d;
}
//deb(V2, gora, dol);
int opt=-1e9;
for(int j=0; j<V2.size(); j++){
if(j==0)opt=max({opt, dol[j], gora[j]});
else opt=max({opt-d*(V2[j].nd.st-V2[j-1].nd.st), dol[j], gora[j]});
opt+=V2[j].nd.nd;
dp[pocz+j]=max(dp[pocz+j], opt);
}
opt=-1e9;
for(int j=V2.size()-1;j>=0; j--){
if(j+1==V2.size())opt=max({opt, dol[j], gora[j]});
else opt=max({opt-u*(V2[j+1].nd.st-V2[j].nd.st), dol[j], gora[j]});
opt+=V2[j].nd.nd;
dp[pocz+j]=max(dp[pocz+j], opt);
}
for(int j=0; j<V2.size(); j++){
ust(V2[j].nd.st, dp[j+pocz]-u*V2[j].nd.st);
ust2(V2[j].nd.st, dp[j+pocz]+d*V2[j].nd.st);
}
//deb(dp[pocz]);
V2.clear();
pocz=i+1;
}
}
int t=max(get2(0, S+1)-d*S, get(S, N)+u*S);
cout<<t;
}
