#include <bits/stdc++.h>
using namespace std;
int main() {
  int c1, c2, c3, c4, n, m;
  int a[1010];
  int b[1010];
  int ans1, ans2, ans3;
  int t1, t2;
  while (~scanf("%d %d %d %d", &c1, &c2, &c3, &c4)) {
    scanf("%d %d", &n, &m);
    t1 = 0;
    t2 = 0;
    for (int i = 0; i < n; i++) {
      scanf("%d", &a[i]);
      t1 += a[i];
    }
    for (int i = 0; i < m; i++) {
      scanf("%d", &b[i]);
      t2 += b[i];
    }
    ans1 = c4;
    ans2 = 0;
    for (int i = 0; i < n; i++) ans2 = ans2 + min(c2, a[i] * c1);
    ans2 = min(c3, ans2);
    ans3 = 0;
    for (int i = 0; i < m; i++) ans3 = ans3 + min(c2, b[i] * c1);
    ans3 = min(c3, ans3);
    printf("%d\n", min(ans1, ans2 + ans3));
  }
  return 0;
}
