1271A - Suits

using namespace std;
int main(void) {
  int a, b, c, d, e, f, ne, nf;
  cin >> a >> b >> c >> d >> e >> f;
  auto ex = [&]() {
    ne = min(a, d);
    d -= ne;
  };
  auto fx = [&]() {
    nf = min({b, c, d});
    d -= nf;
  };
  if (e >= f) {
    ex();
    fx();
  } else {
    fx();
    ex();
  }
  cout << e * ne + f * nf << endl;
  return 0;
}