#include <bits/stdc++.h>
#pragma comment(linker, "/STACK:256000000")
using namespace std;
const int INF = (int)(1e9 + 1e6);
const long long LINF = (long long)(4e18);
const double EPS = 1e-9;
const long long mod = 1e9 + 7;
mt19937 ggen;
void solve();
int main() {
  iostream::sync_with_stdio(false);
  cin.tie(0);
  ggen = mt19937(1337);
  solve();
}
void solve() {
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; ++i) {
    cin >> a[i];
  }
  int x, f;
  cin >> x >> f;
  long long ans = 0;
  long long ft = x + f;
  for (int i = 0; i < n; ++i) {
    long long gh = static_cast<long long>(a[i]);
    long long mt = gh / ft;
    ans += mt * f;
    if (gh - mt * ft > x) {
      ans += f;
    }
  }
  cout << ans;
}
