#include <bits/stdc++.h>
using namespace std;
int main() {
  int c1, c2, c3, c4;
  int n, m, a, sa, sb, lmin;
  while (cin >> c1 >> c2 >> c3 >> c4) {
    cin >> n >> m;
    lmin = sa = sb = 0;
    for (int i = 0; i < n; i++) {
      cin >> a;
      sa += min(a * c1, c2);
    }
    for (int i = 0; i < m; i++) {
      cin >> a;
      sb += min(a * c1, c2);
    }
    sa = min(sa, c3), sb = min(sb, c3);
    lmin = min(sa + sb, min(2 * c3, c4));
    cout << lmin << endl;
  }
  return 0;
}
