#include <bits/stdc++.h>
using namespace std;
int main() {
  int c1, c2, c3, c4;
  int n, m, x;
  int b = 0, t = 0, tot = 0;
  scanf("%d %d %d %d", &c1, &c2, &c3, &c4);
  scanf("%d %d", &n, &m);
  for (int i = 1; i <= n; i++) {
    scanf("%d", &x);
    if (x * c1 > c2)
      b += c2;
    else
      b += x * c1;
  }
  if (b > c3) b = c3;
  for (int i = 1; i <= m; i++) {
    scanf("%d", &x);
    if (x * c1 > c2)
      t += c2;
    else
      t += x * c1;
  }
  if (t > c3) t = c3;
  tot = b + t;
  if (tot > c4) tot = c4;
  printf("%d\n", tot);
}
