#include <bits/stdc++.h>
using namespace std;
vector<int> costs(4);
int calc(int n) {
  int res = 0;
  for (int i = 0; i < n; ++i) {
    int t;
    cin >> t;
    res += min(t * costs[0], costs[1]);
  }
  return min(res, costs[2]);
}
int main() {
  for (int i = 0; i < 4; ++i) {
    cin >> costs[i];
  }
  int n, m;
  cin >> n >> m;
  cout << min(costs[3], calc(n) + calc(m)) << endl;
  return 0;
}
