#include <bits/stdc++.h>
using namespace std;
int dp[1024], n, m, c1, c2, c3, c4, an[1024], am[1024];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> c1 >> c2 >> c3 >> c4;
  cin >> n >> m;
  for (int i = 0; i < n; ++i) cin >> an[i];
  for (int i = 0; i < m; ++i) cin >> am[i];
  int mini = INT_MAX;
  mini = min(mini, c4);
  mini = min(mini, 2 * c3);
  int s1 = 0;
  for (int i = 0; i < n; ++i) {
    s1 += min(c1 * an[i], c2);
  }
  mini = min(mini, c3 + s1);
  int s2 = 0;
  for (int i = 0; i < m; ++i) {
    s2 += min(c1 * am[i], c2);
  }
  mini = min(mini, c3 + s2);
  mini = min(mini, s1 + s2);
  cout << mini << endl;
  return 0;
}
