#include <bits/stdc++.h>
using namespace std;
int main() {
  int ans = 0;
  int c[4];
  cin >> c[0] >> c[1] >> c[2] >> c[3];
  int n, m;
  cin >> n >> m;
  int b[n + 1], t[m + 1];
  for (int i = 0; i < n; i++) {
    cin >> b[i];
  }
  for (int i = 0; i < m; i++) {
    cin >> t[i];
  }
  int sum1 = 0, sum2 = 0;
  for (int i = 0; i < n; i++) {
    sum1 += min(c[1], c[0] * b[i]);
  }
  for (int i = 0; i < m; i++) {
    sum2 += min(c[1], c[0] * t[i]);
  }
  cout << min(c[3],
              min(c[2] + sum1, min(c[2] + sum2, min(c[2] * 2, sum1 + sum2))))
       << endl;
  return 0;
}
