#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1005;
int n, m, c1, c2, c3, c4, a[MAXN], b[MAXN], mini, tro, bus, cnt, tab[MAXN],
    tab1[MAXN];
int main() {
  scanf("%d %d %d %d", &c1, &c2, &c3, &c4);
  scanf("%d %d", &n, &m);
  for (int i = 0; i < (n); i++) scanf("%d", &a[i]);
  for (int i = 0; i < (m); i++) scanf("%d", &b[i]);
  mini = c4;
  for (int i = 0; i < (n); i++) {
    if (a[i] * c1 <= c2)
      tab[i] = a[i] * c1;
    else
      tab[i] = c2;
    cnt += tab[i];
  }
  if (cnt <= c3)
    bus = cnt;
  else
    bus = c3;
  cnt = 0;
  for (int i = 0; i < (m); i++) {
    if (b[i] * c1 <= c2)
      tab1[i] = b[i] * c1;
    else
      tab1[i] = c2;
    cnt += tab1[i];
  }
  if (cnt <= c3)
    tro = cnt;
  else
    tro = c3;
  if (mini > tro + bus) mini = tro + bus;
  printf("%d\n", mini);
  return 0;
}
