#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c, d, n, m, ss = 0, sum = 0, i, x;
  cin >> a >> b >> c >> d >> n >> m;
  for (i = 0; i < n; i++) {
    cin >> x;
    if (a * x < b)
      ss += a * x;
    else
      ss += b;
  }
  if (ss > c)
    sum += c;
  else
    sum += ss;
  ss = 0;
  for (i = 0; i < m; i++) {
    cin >> x;
    if (a * x < b)
      ss += a * x;
    else
      ss += b;
  }
  if (ss > c)
    sum += c;
  else
    sum += ss;
  if (sum > d) sum = d;
  cout << sum << endl;
  return 0;
}
