#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.resize( 4*MAX_N, neutr );
}
void set( int ind, ll val, int x = 1, int lx = 0, int rx = MAX_N ){
if( lx == rx ){
cerr << out( lx ) << out( ind ) << out( val ) << endl;
chkmax( tree[x], val );
cerr << out( tree[x] ) << endl;
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 and 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(), [&]( const std::pair< int, std::pair< int, int > >& a, std::pair< int, std::pair< int, int > >& b){
if( a.first != b.first ) return a.first < b.first;
return a.second > b.second;
});
for( int i=0 ; i < (int)v.size() ; i++ ){
cerr << out( i ) << out( v[i].first ) << out( v[i].second.first ) << out( v[i].second.second ) << endl;
}
cerr << endl;
segUp.build();
segDown.build();
std::vector< ll > dp( MAX_N, neutr );
dp[0] = 0;
segUp.set( L, -L*U + dp[0] );
segDown.set( L, L*D + dp[0] );
cerr << out( segUp.tree[1] ) << endl;
cerr << out( segDown.tree[1] ) << endl;
std::vector< ll > dp2( (int)v.size() );
for( int i=1 ; i < (int)v.size() ; i++ ){
int currPos = v[i].second.first;
//cerr << out( i ) << out( currPos ) << endl;
ll maxUp = segUp.query( currPos, MAX_N -1 );
ll maxDown = segDown.query( 0, currPos );
//cerr << out( maxUp ) << out( maxDown ) << endl;
maxUp += currPos*U + v[i].second.second;
chkmax( dp[currPos], maxUp );
maxDown += -currPos*D + v[i].second.second;
chkmax( dp[currPos], maxDown );
dp2[i] = std::max( maxDown, maxUp );
//cerr << out( maxUp ) << out( maxDown ) << endl;
segUp.set( currPos, -currPos*U + dp[currPos] );
segDown.set( currPos, currPos*D + dp[currPos] );
//cerr << out( i ) << out( dp[currPos] ) << endl;
}
std::cout << dp[L] << endl;
/*
std::vector< ll > dp1( (int)v.size() );
for( int i=1 ; i < (int)v.size() ; i++ ){
for( int j=0 ; j < i ; j ++ ){
ll cost = inf;
ll dist = (ll)v[j].second.first - v[i].second.first;
if( dist >= 0 ) chkmin( cost, (ll)dist*U );
if( dist <= 0 ) chkmin( cost, -1LL*dist*D );
ll A = dp1[j] - cost + v[i].second.second;
chkmax( dp1[i], A );
}
}
std::cout << std::max( dp1[ v.size() -1 ], 0LL ) << endl;
*/
/*
for( int i=0 ; i < (int)v.size() ; i++ ){
cerr << out( i ) << out( dp1[i] ) << out( dp2[i] ) << endl;
}
cerr << endl;
*/
return 0;
}
