#include <bits/stdc++.h>
using namespace std;
long long int power(long long int x, long long int y) {
  if (y == 0) return 1;
  long long int s = power(x, y / 2);
  s *= s;
  if (y % 2 == 1) s *= x;
  return s;
}
long long int fac(long long int x) {
  long long int pppp = 1;
  for (int i = 2; i <= x; i++) {
    pppp *= i;
  }
  return pppp;
}
char ALPH[26] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
                 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r',
                 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
int main() {
  int c1, c2, c3, c4, n, m;
  cin >> c1 >> c2 >> c3 >> c4 >> n >> m;
  int x[n];
  int y[n];
  int h[m];
  int p[m];
  for (int i = 0; i < n; i++) {
    cin >> x[i];
    y[i] = min(x[i] * c1, c2);
  }
  for (int i = 0; i < m; i++) {
    cin >> h[i];
    p[i] = min(h[i] * c1, c2);
  }
  long long int sumt = 0;
  long long int sumb = 0;
  for (int i = 0; i < n; i++) {
    sumb += y[i];
  }
  for (int i = 0; i < m; i++) {
    sumt += p[i];
  }
  vector<long long int> v;
  v.push_back(sumb + sumt);
  v.push_back(sumb + c3);
  v.push_back(sumt + c3);
  v.push_back(c4);
  v.push_back(c3 * 2);
  sort(v.begin(), v.end());
  cout << v[0];
  return 0;
}
