#include <bits/stdc++.h>
using namespace std;
int types[4];
int main() {
  for (int i = 0; i < 4; i++) cin >> types[i];
  int n, m, a, c = 0, d = 0;
  cin >> n >> m;
  for (int i = 0; i < n; i++) cin >> a, c += min(a * types[0], types[1]);
  c = min(c, types[2]);
  for (int i = 0; i < m; i++) cin >> a, d += min(a * types[0], types[1]);
  d = min(d, types[2]);
  cout << min(types[3], c + d);
}
