#include <bits/stdc++.h>
using namespace std;
int c1, c2, c3, c4, n, m;
const int maxn = 1050;
int a[maxn], b[maxn];
int p, q, r, s;
int x, y;
int main() {
  cin >> c1 >> c2 >> c3 >> c4;
  cin >> n >> m;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    x += min(c1 * a[i], c2);
  }
  for (int i = 0; i < m; i++) {
    cin >> b[i];
    y += min(c1 * b[i], c2);
  }
  cout << min(min(x, c3) + min(y, c3), c4) << endl;
  return 0;
}
