#include <bits/stdc++.h>
#define pii pair<int, int>
#define x first
#define y second
using namespace std;
const int N = 5e5+5;
const int INF = 1e9+1;
void update(int t[], int x, int k) { for(t[x += N] = k; x != 1; x >>= 1) t[x>>1] = max(t[x], t[x^1]); }
int query(int t[], int l, int r) {
int ret = -INF;
for(l += N, r += N+1; l < r; l >>= 1, r >>= 1) {
if(l & 1) ret = max(ret, t[l++]);
if(r & 1) ret = max(ret, t[--r]);
}
return ret;
}
int n, u, d, s;
int dp[N], t1[N<<1], t2[N<<1];
vector<pii> fair[N];
int main() {
scanf("%d %d %d %d", &n, &u, &d, &s);
for(int i = 1, d, a, b; i <= n; i++) {
scanf("%d %d %d", &d, &a, &b);
fair[d].emplace_back(a, b);
}
fair[N-1].emplace_back(s, 0);
for(int i = 0; i < N; i++) {
dp[i] = (i == s ? 0 : -INF);
update(t1, i, dp[i] + i * d);
update(t2, i, dp[i] - i * u);
}
for(int i = 0; i < N; i++) {
sort(fair[i].begin(), fair[i].end());
int mx = -INF;
map<int, int> mp;
for(int j = 0, pos, m; j < fair[i].size(); j++) {
tie(pos, m) = fair[i][j];
int down_stream = max(mx, query(t1, 0, pos)) - pos * d;
int up_stream = query(t2, pos, N-1) + pos * u;
mp[pos] = max(down_stream, up_stream) + m;
mx = max(mx, mp[pos] + pos * d);
}
mx = -INF;
for(int j = fair[i].size()-1, pos, m; ~j; j--) {
tie(pos, m) = fair[i][j];
int down_stream = query(t1, 0, pos) - pos * d;
int up_stream = max(mx, query(t2, pos, N-1)) + pos * u;
dp[pos] = max(down_stream, up_stream) + m;
mx = max(mx, dp[pos] - pos * u);
}
for(int j = 0, pos, m; j < fair[i].size(); j++) {
tie(pos, m) = fair[i][j];
dp[pos] = max(dp[pos], mp[pos]);
update(t1, pos, dp[pos] + pos * d);
update(t2, pos, dp[pos] - pos * u);
}
}
printf("%d\n", dp[s]);
return 0;
}
