#include <bits/stdc++.h>
using namespace std;
int main() {
  int i, a, b, c, d, x, y, n, m;
  int ans = 0, sum = 0;
  scanf("%d %d %d %d", &a, &b, &c, &d);
  scanf("%d %d", &n, &m);
  for (i = 0; i < n; i++) {
    scanf("%d", &x);
    if (x * a < b)
      ans += (x * a);
    else
      ans += b;
  }
  if (ans > c) ans = c;
  for (i = 0; i < m; i++) {
    scanf("%d", &x);
    if (x * a < b)
      sum += (x * a);
    else
      sum += b;
  }
  if (sum > c) sum = c;
  ans = ans + sum;
  if (ans > 2 * c) ans = 2 * c;
  if (ans > d) ans = d;
  printf("%d\n", ans);
  return 0;
}
