#include <bits/stdc++.h>
using namespace std;
long long powi(long long base, int p) {
  long long res = 1;
  while (p--) res *= base;
  return res;
}
long long gcd(long long a, long long b) { return b == 0 ? a : gcd(b, a % b); }
bool is_vowel(char c) {
  c = tolower(c);
  return c == 'a' || c == 'e' || c == 'o' || c == 'i' || c == 'u' || c == 'y';
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int c1, c2, c3, c4;
  cin >> c1 >> c2 >> c3 >> c4;
  int n, m;
  cin >> n >> m;
  int aa = 0, bb = 0;
  for (int i = 0, a; i < n; i++) {
    cin >> a;
    if (a * c1 < c2)
      aa += a * c1;
    else
      aa += c2;
  }
  aa = min(aa, c3);
  for (int i = 0, b; i < m; i++) {
    cin >> b;
    if (b * c1 < c2)
      bb += b * c1;
    else
      bb += c2;
  }
  bb = min(bb, c3);
  cout << min(aa + bb, c4);
  return 0;
}
