#include <bits/stdc++.h>
using namespace std;
int c1, c2, c3, c4;
int n, m;
int an[1900];
int bm[1600];
int a[1900];
int b[1900];
int ans1, ans2, ans;
int main() {
  cin >> c1 >> c2 >> c3 >> c4;
  cin >> n >> m;
  for (int i = 1; i <= n; i++) {
    cin >> an[i];
    a[i] = min(an[i] * c1, c2);
    ans1 = ans1 + a[i];
  }
  for (int i = 1; i <= m; i++) {
    cin >> bm[i];
    b[i] = min(bm[i] * c1, c2);
    ans2 = ans2 + b[i];
  }
  ans1 = min(ans1, c3);
  ans2 = min(ans2, c3);
  ans = min(ans1 + ans2, c4);
  cout << ans;
  cin >> n;
  return 0;
}
