#include <bits/stdc++.h>
using namespace std;
int c1, c2, c3, c4, n, m, a[1001], b[1001], sum1, sum2, x;
int main() {
  cin >> c1 >> c2 >> c3 >> c4 >> n >> m;
  for (int i = 0; i < n; i++) cin >> a[i];
  for (int i = 0; i < m; i++) cin >> b[i];
  for (int i = 0; i < n; i++) {
    x = c1 * a[i];
    if (c2 > x)
      sum1 += x;
    else
      sum1 += c2;
  }
  if (sum1 > c3) sum1 = c3;
  for (int i = 0; i < m; i++) {
    x = c1 * b[i];
    if (c2 > x)
      sum2 += x;
    else
      sum2 += c2;
  }
  if (sum2 > c3) sum2 = c3;
  if (sum1 + sum2 > c4)
    cout << c4 << endl;
  else
    cout << sum1 + sum2 << endl;
  return 0;
}
