#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL), cout.tie(NULL);
  int c1, c2, c3, c4;
  cin >> c1 >> c2 >> c3 >> c4;
  vector<int> ans;
  ans.push_back(c4);
  ans.push_back(c3 * 2);
  int tmp = 0, tmp1 = 0;
  int n, m, a;
  cin >> n >> m;
  while (n--) {
    cin >> a;
    tmp += min(a * c1, c2);
  }
  while (m--) {
    cin >> a;
    tmp1 += min(a * c1, c2);
  }
  tmp1 = min(tmp1, c3);
  tmp = min(tmp, c3);
  ans.push_back(tmp1 + tmp);
  sort(ans.begin(), ans.end());
  cout << ans[0];
}
