#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n;
  cin >> n;
  long long a[n + 10];
  for (int i = 1; i <= n; ++i) scanf("%lld", &a[i]);
  long long x, y;
  cin >> x >> y;
  long long h = x + y;
  long long sum = 0;
  for (int i = 1; i <= n; ++i) {
    sum = sum + y * (a[i] / (h));
    a[i] = a[i] % h;
    if (a[i] > x) sum += y;
  }
  cout << sum;
  return 0;
}
