#include <bits/stdc++.h>
using namespace std;
int c1, c2, c3, c4;
int n, m;
int bu, tr;
int main() {
  scanf("%d %d %d %d", &c1, &c2, &c3, &c4);
  scanf("%d %d", &n, &m);
  for (int i = 0; i < n; i++) {
    int t;
    scanf("%d", &t);
    bu += (t * c1 > c2 ? c2 : t * c1);
  }
  for (int i = 0; i < m; i++) {
    int t;
    scanf("%d", &t);
    tr += (t * c1 > c2 ? c2 : t * c1);
  }
  bu = (bu > c3 ? c3 : bu);
  tr = (tr > c3 ? c3 : tr);
  printf("%d", (c4 > bu + tr ? bu + tr : c4));
}
