#include <bits/stdc++.h>
using namespace std;
int main() {
  int b, t, c1, c2, c3, c4, mb = 0, mt = 0, jb = 0, jt = 0, mini;
  int bus[1234], trolley[1234];
  scanf("%d%d%d%d", &c1, &c2, &c3, &c4);
  scanf("%d %d", &b, &t);
  for (int i = 0; i < b; i++) {
    scanf("%d", &bus[i]);
    jb += bus[i];
  }
  for (int i = 0; i < t; i++) {
    scanf("%d", &trolley[i]);
    jt += trolley[i];
  }
  for (int i = 0; i < b; i++) {
    mb += min(c1 * bus[i], c2);
  }
  mb = min(mb, c3);
  for (int i = 0; i < t; i++) {
    mt += min(c1 * trolley[i], c2);
  }
  mt = min(mt, c3);
  mini = min(c4, mt + mb);
  printf("%d\n", mini);
  return 0;
}
