#include <bits/stdc++.h>   using namespace std;   using ll = long long int;   void fast() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);   }   int main() {     fast();     int t, b, p, f, h, c;     cin >> t;     while (t--) {       cin >> b >> p >> f;       cin >> h >> c;       int bun = b / 2;       if (bun >= p + f) {         cout << p * h + f * c << endl;       } else {         if (c > h) {           if (bun >= f) {             cout << f * c + (bun - f) * h << endl;           } else {             cout << bun * c << endl;           }         } else {           if (bun >= p) {             cout << p * h + (bun - p) * c << endl;           } else {             cout << bun * h << endl;           }         }       }     }     return 0;   }   