#include <bits/stdc++.h>
using namespace std;
int n, m;
int a[3000], b[3000];
int c1, c2, c3, c4;
int main() {
  while (cin >> c1 >> c2 >> c3 >> c4) {
    cin >> n >> m;
    for (int i = 0; i < n; ++i) cin >> a[i];
    for (int i = 0; i < m; ++i) cin >> b[i];
    int suma = 0;
    for (int i = 0; i < n; ++i) suma += min(a[i] * c1, c2);
    suma = min(suma, c3);
    int sumb = 0;
    for (int i = 0; i < m; ++i) sumb += min(b[i] * c1, c2);
    sumb = min(sumb, c3);
    int sum = min(suma + sumb, c4);
    cout << sum << endl;
  }
  return 0;
}
