#include <bits/stdc++.h>
using namespace std;
int main() {
  int c1, c2, c3, c4;
  cin >> c1 >> c2 >> c3 >> c4;
  int n, m;
  cin >> n >> m;
  int costBus[n];
  int totalCostBus = 0;
  for (int i = 0; i < n; i++) {
    int temp;
    cin >> temp;
    costBus[i] = min(temp * c1, c2);
    totalCostBus += costBus[i];
  }
  int costTrolley[m];
  int totalCostTrolley = 0;
  for (int i = 0; i < m; i++) {
    int temp;
    cin >> temp;
    costTrolley[i] = min(temp * c1, c2);
    totalCostTrolley += costTrolley[i];
  }
  int result = c4;
  result = min(result, c3 + c3);
  result = min(result, c3 + totalCostTrolley);
  result = min(result, totalCostBus + c3);
  result = min(result, totalCostBus + totalCostTrolley);
  cout << result << endl;
  return 0;
}
