#include <bits/stdc++.h>
using namespace std;
inline int read() {
  int data = 0, w = 1;
  char ch = getchar();
  while (ch != '-' && (ch < '0' || ch > '9')) ch = getchar();
  if (ch == '-') w = -1, ch = getchar();
  while (ch >= '0' && ch <= '9')
    data = (data << 3) + (data << 1) + (ch ^ 48), ch = getchar();
  return data * w;
}
const int maxn(200010);
long long n, a[maxn], x, f, ans;
int main() {
  n = read();
  for (register int i = 1; i <= n; i++) a[i] = read();
  x = read();
  f = read();
  for (register int i = 1; i <= n; i++) {
    a[i] -= x;
    if (a[i] > 0) {
      if (!(a[i] % (x + f)))
        ans += (a[i] / (x + f)) * f;
      else
        ans += (1 + a[i] / (x + f)) * f;
    }
  }
  printf("%I64d\n", ans);
  return 0;
}
