#include <bits/stdc++.h>
using namespace std;
long int c1, c2, c3, c4, n, m, a[2000], b[2000], i, j;
long int cur, sum1, sum2;
int main() {
  cin >> c1 >> c2 >> c3 >> c4;
  cin >> n >> m;
  for (i = 1; i <= n; i++) cin >> a[i];
  for (i = 1; i <= m; i++) cin >> b[i];
  for (i = 1; i <= n; i++) {
    cur = a[i] * c1;
    sum1 += min(cur, c2);
  }
  sum1 = min(sum1, c3);
  for (i = 1; i <= m; i++) {
    cur = b[i] * c1;
    sum2 += min(cur, c2);
  }
  sum2 = min(sum2, c3);
  cout << min(sum1 + sum2, c4) << endl;
  return 0;
}
