#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,b,p,f,h,c,d,e;
    cin>>n;
    while(n--)
    {
        cin>>b>>p>>f;
        cin>>h>>c;
        d=(p*2)+(f*2);
        if(b>=d)
           cout<<(p*h)+(f*c)<<endl;
           else{
           e=b/2;
           if(h>c){
               if(p<=e && f<=(e-p))
           cout<<(p*h)+((f*c))<<endl;
           else if (p<=e && f>(e-p))
            cout<<(p*h)+((e-p)*c);
            else if(p>e)
                cout<<(p*h)<<endl;
           }
           else if(c>h){
               if(f<=e && p<=(e-f))
           cout<<(p*h)+((f*c))<<endl;
           else if (f<=e && p>(e-f))
            cout<<((e-f)*h)+(f*c);
            else if(f>e)
                cout<<(f*c)<<endl;
           }
           }
    }
    return 0;
}