#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, c[4], b[1009], t[1009], s1 = 0, s2 = 0, s = 0, sb = 0, st = 0;
  for (int i = 0; i < 4; i++) cin >> c[i];
  cin >> n >> m;
  for (int i = 0; i < n; i++) {
    cin >> b[i];
    sb += min(b[i] * c[0], c[1]);
    s1 += b[i];
  }
  for (int i = 0; i < m; i++) {
    cin >> t[i];
    st += min(t[i] * c[0], c[1]);
    s1 += t[i];
  }
  s = min(sb, c[2]) + min(st, c[2]);
  s = min(s, c[3]);
  cout << s << endl;
  return 0;
}
