#include <bits/stdc++.h>
#define task "S"
#define all(v) (v).begin(), (v).end()
#define rep(i, l, r) for (int i = (l); i <= (r); ++i)
#define Rep(i, r, l) for (int i = (r); i >= (l); --i)
#define DB(X) { cerr << #X << " = " << (X) << '\n'; }
#define DB1(A, _) { cerr << #A << "[" << _ << "] = " << (A[_]) << '\n'; }
#define DB2(A, _, __) { cerr << #A << "[" << _ << "][" << __ << "] = " << (A[_][__]) << '\n'; }
#define DB3(A, _, __, ___) { cerr << #A << "[" << _ << "][" << __ << "][" << ___ << "] = " << (A[_][__][___]) << '\n'; }
#define PR(A, l, r) { cerr << '\n'; rep(_, l, r) DB1(A, _); cerr << '\n';}
#define SZ(x) ((int)(x).size())
#define pb push_back
#define eb emplace_back
#define pf push_front
#define F first
#define S second
#define by(x) [](const auto& a, const auto& b) { return a.x < b.x; } // sort(arr, arr + N, by(a));
#define next ___next
#define prev ___prev
#define y1 ___y1
#define left ___left
#define right ___right
#define y0 ___y0
#define div ___div
#define j0 ___j0
#define jn ___jn
using ll = long long;
using ld = long double;
using ull = unsigned long long;
using namespace std;
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<ll> vl;
const int N = 5e5 + 2, INF = 2e9 + 1;
int n, D, U, S, dp[N], bitLD[N], bitRU[N], ndp[N];
struct Event
{
int days, pos, money;
bool operator < (const Event &oth)
{
return days < oth.days || (days == oth.days && pos < oth.pos);
}
};
vector<Event> eve;
void updLD(int p, int v)
{
for (; p < N; p += p & -p) bitLD[p] = max(bitLD[p], v);
}
int queryLD(int p)
{
int res = -INF;
for (; p; p -= p & -p) res = max(res, bitLD[p]);
return res;
}
void updRU(int p, int v)
{
for (; p; p -= p & -p) bitRU[p] = max(bitRU[p], v);
}
int queryRU(int p)
{
int res = -INF;
for (; p < N; p += p & -p) res = max(res, bitRU[p]);
return res;
}
struct IT
{
vi it, lz;
IT(int nn) {it.assign(nn << 2, -INF); lz.assign(nn << 2, 0);}
void dolz(int id, int l, int r)
{
if (lz[id] == 0 || it[id] == -INF) return;
it[id] += lz[id];
if (l != r)
{
lz[id << 1] += lz[id];
lz[(id << 1) | 1] += lz[id];
}
lz[id] = 0;
}
void update(int id, int l, int r, int L, int R, int v, int ty)
{
dolz(id, l, r);
if (l > R || r < L) return;
if (L <= l && r <= R)
{
if (ty == 0)
{
assert(L == R);
it[id] = v;
} else
{
lz[id] += v;
dolz(id, l, r);
}
return;
}
int m = (l + r) >> 1;
update(id << 1, l, m, L, R, v, ty);
update((id << 1) | 1, m + 1, r, L, R, v, ty);
it[id] = max(it[id << 1], it[(id << 1) | 1]);
}
int query(int id, int l, int r, int L, int R)
{
dolz(id, l, r);
if (l > R || r < L) return -INF;
if (L <= l && r <= R) return it[id];
int m = (l + r) >> 1;
return max(query(id << 1, l, m, L, R), query((id << 1) | 1, m + 1, r, L, R));
}
void rollback(int id, int l, int r)
{
lz[id] = 0, it[id] = -INF;
if (l == r) return;
int m = (l + r) >> 1;
if (it[id << 1] != -INF || lz[id << 1] != 0) rollback(id << 1, l, m);
if (it[(id << 1) | 1] != -INF || lz[(id << 1) | 1] != 0) rollback((id << 1) | 1, m + 1, r);
}
};
int main()
{
#ifdef HynDuf
freopen(task".in", "r", stdin);
//freopen(task".out", "w", stdout);
#else
ios_base::sync_with_stdio(false); cin.tie(nullptr);
#endif
cin >> n >> U >> D >> S;
eve.assign(n + 1, {});
rep(i, 1, n) cin >> eve[i].days >> eve[i].pos >> eve[i].money;
fill(bitLD + 1, bitLD + N, -INF);
fill(bitRU + 1, bitRU + N, -INF);
IT seg(N);
sort(1 + all(eve));
updLD(S, D * S);
updRU(S, -U * S);
for (int i = 1, j = 1; i <= n; i = j)
{
while (j <= n && eve[j].days == eve[i].days) j++;
rep(k, i, j - 1)
{
const Event &E = eve[k];
dp[k] = max(queryLD(E.pos) - D * E.pos, queryRU(E.pos) + U * E.pos) + E.money;
ndp[k] = max(dp[k], seg.query(1, 1, N - 1, 1, E.pos - 1) + E.money - D * E.pos);
seg.update(1, 1, N - 1, E.pos, E.pos, dp[k] + D * E.pos, 0);
seg.update(1, 1, N - 1, 1, E.pos - 1, E.money, 1);
}
seg.rollback(1, 1, N - 1);
Rep(k, j - 1, i)
{
const Event &E = eve[k];
ndp[k] = max(ndp[k], seg.query(1, 1, N - 1, E.pos + 1, N - 1) + E.money + U * E.pos);
seg.update(1, 1, N - 1, E.pos, E.pos, dp[k] - U * E.pos, 0);
seg.update(1, 1, N - 1, E.pos + 1, N - 1, E.money, 1);
updLD(E.pos, ndp[k] + D * E.pos);
updRU(E.pos, ndp[k] - U * E.pos);
dp[k] = ndp[k];
}
seg.rollback(1, 1, N - 1);
}
int ans = 0;
rep(i, 1, n) ans = max(ans, dp[i] - ((eve[i].pos < S) ? D * (S - eve[i].pos) : U * (eve[i].pos - S)));
cout << ans;
return 0;
}
