#include <bits/stdc++.h>
using namespace std;
int main() {
  int i, j, k, l, m, n;
  int T, M, N, K, t1, t2, t3, t4, t5, D;
  long long ans, out;
  cin >> t1 >> t2 >> t3 >> t4;
  cin >> N >> M;
  int troll = 0, bus = 0;
  for (i = 0; i < N; ++i) {
    cin >> k;
    bus += min(k * t1, t2);
  }
  bus = min(bus, t3);
  for (i = 0; i < M; ++i) {
    cin >> k;
    troll += min(k * t1, t2);
  }
  troll = min(troll, t3);
  cout << min(t4, bus + troll) << endl;
  return 0;
}
