#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int t;
  cin >> t;
  while (t--) {
    long long int a, b, c, d, e, y = 0, x = 0, l = 0, z = 0, k = 0, m = 0;
    cin >> a >> b >> c >> d >> e;
    if (d > e) {
      while (a > 1 && b > 0) {
        y++;
        a = a - 2;
        b = b - 1;
      }
      while (a > 1 && c > 0) {
        x++;
        a = a - 2;
        c = c - 1;
      }
      l = (d * y) + (x * e);
      cout << l << endl;
    } else {
      while (a > 1 && c > 0) {
        z++;
        a = a - 2;
        c = c - 1;
      }
      while (a > 1 && b > 0) {
        k++;
        a = a - 2;
        b = b - 1;
      }
      m = (e * z) + (k * d);
      cout << m << endl;
    }
    y = 0, x = 0, l = 0, z = 0, k = 0, m = 0;
  }
  return 0;
}
