#include <bits/stdc++.h>
using namespace std;
int main() {
  long long c1, c2, c3, c4, n, m, b[1005], t[1005], sum_b, sum_t, ans, temp;
  cin >> c1 >> c2 >> c3 >> c4;
  cin >> n >> m;
  sum_b = sum_t = 0;
  for (long long i = 0; i < n; i++) {
    cin >> b[i];
    sum_b += b[i];
  }
  for (long long i = 0; i < m; i++) {
    cin >> t[i];
    sum_t += t[i];
  }
  ans = c4;
  ans = min(ans, c3 * 2);
  temp = c3;
  for (long long i = 0; i < n; i++) {
    temp += min(b[i] * c1, c2);
  }
  ans = min(ans, temp);
  temp = c3;
  for (long long i = 0; i < m; i++) {
    temp += min(t[i] * c1, c2);
  }
  ans = min(ans, temp);
  temp = 0;
  for (long long i = 0; i < n; i++) {
    temp += min(b[i] * c1, c2);
  }
  for (long long i = 0; i < m; i++) {
    temp += min(t[i] * c1, c2);
  }
  ans = min(ans, temp);
  temp = (sum_b + sum_t) * c1;
  ans = min(ans, temp);
  cout << ans << "\n";
  return 0;
}
