#include <bits/stdc++.h>
using namespace std;
const int N = 1005;
int n, m;
int c1, c2, c3, c4;
int a[N], b[N];
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);
  }
  int bus = 0, trol = 0;
  for (int i = 0; i < n; i++) {
    bus += min(a[i] * c1, c2);
  }
  for (int i = 0; i < m; i++) {
    trol += min(b[i] * c1, c2);
  }
  printf("%d\n", min(min(bus, c3) + min(trol, c3), c4));
  return 0;
}
