#include<iostream>
#include<algorithm>

using namespace std;

int main()
{
    int a,b,c,d,e,f;
    int t;
    cin>>t;
    while(t--)
    {
        int ans1 = 0,ans2 = 0,num = 0;
        cin>>a>>b>>c>>d>>e>>f;
        num = d;
        ans1 += min(a,num)*e,num -= min(a,num),ans1 += min(min(b,c),num)*f;
        num = d;
        ans2 += min(min(b,c),num)*f,num -= min(min(b,c),num),ans2 += min(a,num)*e;

        cout<<max(ans1,ans2)<<endl;
    }
    return 0;
}