#include <iostream>
using namespace std;
int main() {
int a,b,c,d,e,f;
cin >> a >> b >> c >> d >> e >> f ;
int x = min(b,c);
long long ans=0;
if(e>f){
ans+=e*(min(a,d));
d-=min(a,d);
ans+=f*min(x,d);
}
else {
ans+=f*(min(x,d));
d-=min(x,d);
ans+=e*min(a,d);
}
cout << ans << endl;
return 0;
}
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