#include <bits/stdc++.h>
using namespace std;
int c1, c2, c3, c4, n, m, p, q;
int main() {
  cin >> c1 >> c2 >> c3 >> c4 >> n >> m;
  vector<int> a(n), b(m);
  for (int i = 0; i < (int)n; ++i) {
    cin >> a[i];
    a[i] = min(a[i] * c1, c2);
  }
  for (int i = 0; i < (int)m; ++i) {
    cin >> b[i];
    b[i] = min(b[i] * c1, c2);
  }
  p = accumulate(begin(a), end(a), 0);
  q = accumulate(begin(b), end(b), 0);
  vector<int> d{c4, c3 * 2, p + q, p + c3, c3 + q};
  cout << *min_element(begin(d), end(d)) << endl;
}
