#include <bits/stdc++.h>
using namespace std;
int main() {
  int c1, c2, c3, c4, n, m, i;
  scanf("%d%d%d%d", &c1, &c2, &c3, &c4);
  scanf("%d%d", &n, &m);
  int x, s1 = 0, s2 = 0;
  for (i = 1; i <= n; i++) {
    scanf("%d", &x);
    x = min(x * c1, c2);
    s1 += x;
  }
  for (i = 1; i <= m; i++) {
    scanf("%d", &x);
    x = min(x * c1, c2);
    s2 += x;
  }
  s1 = min(s1, c3);
  s2 = min(s2, c3);
  int ans = min(c4, s1 + s2);
  cout << ans << endl;
  return 0;
}
