#include <bits/stdc++.h>
using namespace std;
const long long MOD = 998244353;
const long long MAX = 1e5 + 7;
const long long dx[8] = {-1, -1, -1, 0, 1, 1, 1, 0};
const long long dy[8] = {-1, 0, 1, 1, 1, 0, -1, -1};
long long i, j, k, t, n, q, l, r, mid;
long long tsum, bsum, x, c1, c2, c3, c4, nbc, ntc, sum;
void solve() {
  cin >> c1 >> c2 >> c3 >> c4;
  cin >> nbc >> ntc;
  for (i = 0; i < nbc; i++) {
    cin >> x;
    bsum += min(c1 * x, c2);
  }
  if (bsum > c3) {
    sum += c3;
  } else
    sum += bsum;
  for (i = 0; i < ntc; i++) {
    cin >> x;
    tsum += min(c1 * x, c2);
  }
  if (tsum > c3) {
    sum += c3;
  } else
    sum += tsum;
  if (sum < c4) {
    cout << sum << endl;
  } else {
    cout << c4 << endl;
  }
}
int32_t main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  solve();
  return 0;
}
