#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 b[n], t[m];
  for (int i = 0; i < n; ++i) cin >> b[i];
  for (int i = 0; i < m; ++i) cin >> t[i];
  int b1, sumb1;
  b1 = 0;
  for (int i = 0; i < n; ++i) b1 += min(b[i] * c1, c2);
  sumb1 = min(b1, c3);
  int t1, sumt1;
  t1 = 0;
  for (int i = 0; i < m; ++i) t1 += min(t[i] * c1, c2);
  sumt1 = min(t1, c3);
  int ans = min(sumb1 + sumt1, c4);
  cout << ans << endl;
  return 0;
}
