#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long c1, c2, c3, c4;
  cin >> c1 >> c2 >> c3 >> c4;
  long long n, m;
  cin >> n >> m;
  long long a[n], b[m];
  for (long long i = 0; i < n; i++) cin >> a[i];
  for (long long i = 0; i < m; i++) cin >> b[i];
  long long bc = 0, tc = 0, tot = 0;
  for (long long i = 0; i < n; i++) {
    bc += min(a[i] * c1, c2);
  }
  bc = min(bc, c3);
  for (long long i = 0; i < m; i++) {
    tc += min(b[i] * c1, c2);
  }
  tc = min(tc, c3);
  tot = min(tc + bc, c4);
  cout << tot;
}
