#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c, d, e, f;
  cin >> a >> b >> c >> d >> e >> f;
  long k = min(d, min(c, b));
  long m = min(a, d);
  long cost = 0;
  if (e > f) {
    d = d - m;
    cost = m * e + min(d, min(c, b)) * f;
  } else {
    d = d - k;
    cost = k * f + min(a, d) * e;
  }
  cout << cost << endl;
  return 0;
}
