#include <bits/stdc++.h>
using namespace std;
int main() {
  int c1, c2, c3, c4;
  int n, m;
  cin >> c1 >> c2 >> c3 >> c4;
  cin >> n >> m;
  vector<int> a(n), b(m);
  for (int i = 0; i < n; i++) cin >> a[i];
  for (int i = 0; i < m; i++) cin >> b[i];
  vector<int> sa(n), sb(m);
  for (int i = 0; i < n; i++) sa[i] = min(a[i] * c1, c2);
  for (int i = 0; i < m; i++) sb[i] = min(b[i] * c1, c2);
  int ssa = 0, ssb = 0;
  for (int i = 0; i < n; i++) ssa += sa[i];
  for (int j = 0; j < m; j++) ssb += sb[j];
  ssa = min(ssa, c3);
  ssb = min(ssb, c3);
  int res = min(ssa + ssb, c4);
  cout << res;
}
