#include <bits/stdc++.h>
using namespace std;
int main() {
  int c1, c2, c3, c4, sumbus = 0, sumtrol = 0;
  cin >> c1 >> c2 >> c3 >> c4;
  int n, m;
  cin >> n >> m;
  int a[n], b[m], cbus[n], ctrol[m];
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    cbus[i] = min(a[i] * c1, c2);
    sumbus += cbus[i];
  }
  for (int i = 0; i < m; i++) {
    cin >> b[i];
    ctrol[i] = min(b[i] * c1, c2);
    sumtrol += ctrol[i];
  }
  sumbus = min(sumbus, c3);
  sumtrol = min(sumtrol, c3);
  int sumcost = min(sumbus + sumtrol, c4);
  cout << sumcost;
  return 0;
}
