#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long a, b, c, d, e, first;     cin >> a >> b >> c >> d >> e >> first;     b = min(c, b);     if (d < a && d < b)       cout << d * max(e, first);     else {       long long p = min(a, d) * e + min(d - min(d, a), b) * first;       long long q = min(b, d) * first + min(d - min(d, b), a) * e;       cout << max(p, q);     }   }   