#include <bits/stdc++.h>
using namespace std;
int main() {
  long long c1, c2, c3, c4, n, m, b[1005], t[1005], ans;
  cin >> c1 >> c2 >> c3 >> c4;
  cin >> n >> m;
  for (long long i = 0; i < n; i++) cin >> b[i];
  for (long long i = 0; i < m; i++) cin >> t[i];
  long long temp1 = 0, temp2 = 0;
  for (long long i = 0; i < n; i++) temp1 += min(b[i] * c1, c2);
  temp1 = min(temp1, c3);
  for (long long i = 0; i < m; i++) temp2 += min(t[i] * c1, c2);
  temp2 = min(temp2, c3);
  ans = min(c4, temp1 + temp2);
  cout << ans << "\n";
  return 0;
}
