#include <bits/stdc++.h>
using namespace std;
int main() {
  int c1, c2, c3, c4, n, m;
  scanf("%d %d %d %d %d %d", &c1, &c2, &c3, &c4, &n, &m);
  int V[n], W[m];
  for (int i = 0; i < n; i++) scanf("%d", &V[i]);
  for (int i = 0; i < m; i++) scanf("%d", &W[i]);
  int s1 = 0, s2 = 0, s3 = 0;
  for (int i = 0; i < n; i++) {
    if (c1 * V[i] < c2)
      s1 += c1 * V[i];
    else
      s1 += c2;
  }
  if (s1 < c3)
    s2 += s1;
  else
    s2 += c3;
  for (int i = 0; i < m; i++) {
    if (c1 * W[i] < c2)
      s3 += c1 * W[i];
    else
      s3 += c2;
  }
  if (s3 < c3)
    s2 += s3;
  else
    s2 += c3;
  if (s2 < c4)
    printf("%d\n", s2);
  else
    printf("%d\n", c4);
  return 0;
}
