#include <bits/stdc++.h>
using namespace std;
int c[4], n, m;
int a[1010], b[1010], ans;
int main() {
  for (int i = 0; i < 4; i++) cin >> c[i];
  cin >> n >> m;
  for (int i = 0; i < n; i++) cin >> a[i];
  for (int i = 0; i < m; i++) cin >> b[i];
  ans = c[3];
  int s1 = 0, s2 = 0;
  for (int i = 0; i < n; i++)
    if (a[i] * c[0] < c[1])
      s1 += a[i] * c[0];
    else
      s1 += c[1];
  for (int i = 0; i < m; i++)
    if (b[i] * c[0] < c[1])
      s2 += b[i] * c[0];
    else
      s2 += c[1];
  s1 = min(s1, c[2]);
  s2 = min(s2, c[2]);
  ans = min(ans, s1 + s2);
  cout << ans << endl;
  return 0;
}
