#include <iostream>

using namespace std;

int a[101];

int main(){
    int t, b, p, f, h, c,summ;

    cin >> t;
    for (int i = 0;i < t; ++i){
        summ = 0;
        cin >> b >> p >> f;
        cin >> h >> c;
        if (b < 2){
            continue;
        }
        if (h > c){
            while (b > 1 && p >= 1){
                b-=2;
                p-=1;
                summ+=h;
            }
            if (b > 1 && f >= 1){
                while ( b > 1 && f >= 1 ) {
                    b-=2;
                    f-=1;
                    summ+=c;
                }
            }
        } else {
            while (b > 1 && f >= 1){
                b-=2;
                f-=1;
                summ+=c;
            }
            if (b > 1 && p >= 1){
                while ( b > 1 && p >= 1 ) {
                    b-=2;
                    p-=1;
                    summ+=h;
                }

        }
    }
    b = 0;
    p = 0;
    f = 0;
    h = 0;
    c = 0;

    a[i] = summ;
    }
    for (int i = 0; i < t ;++i){
        cout << a[i] << endl;
    }
    return 0;
}