#include <bits/stdc++.h>
using namespace std;
int c1, c2, c3, c4;
int n, m;
int a[1010], b[1010];
long sum = 0;
int main() {
  cin >> c1 >> c2 >> c3 >> c4;
  cin >> n >> m;
  for (int i = 0; i < n; ++i) {
    scanf("%d", &a[i]);
  }
  for (int i = 0; i < m; ++i) {
    scanf("%d", &b[i]);
  }
  sum = c4;
  if (sum > 2 * c3) {
    sum = 2 * c3;
  }
  long sumB = 0;
  for (int i = 0; i < n; ++i) {
    a[i] = min(a[i] * c1, c2);
    sumB += a[i];
  }
  if (sumB > c3) {
    sumB = c3;
  }
  long sumT = 0;
  for (int i = 0; i < m; ++i) {
    b[i] = min(b[i] * c1, c2);
    sumT += b[i];
  }
  if (sumT > c3) {
    sumT = c3;
  }
  if (sum > sumB + sumT) {
    sum = sumB + sumT;
  }
  cout << sum;
  return 0;
}
