#include <bits/stdc++.h>
using namespace std;

constexpr long long inf = 9e18;

int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  int tt;
  cin >> tt;
  while (tt--) {
    long long a, b, c, x, y, z;
    cin >> a >> b >> c >> z >> x >> y;
    long long res = inf;
    for (int _ = 2; _--; ) {
      {
        long long ca = max(c - a + 1, 0LL), cb = max(max(a, c + 1) - b + 1, 0LL);
        long long crr = ca * x + cb * y;
        if (a + ca - (ca + cb) > 0 and b + cb - (ca + cb) > 0 and c - (ca + cb) > 0) {
          res = min(res, crr);
        }
      }
      {
        long long ca = max(b - a + 1, 0LL), cc = max(max(a, b + 1) - c + 1, 0LL);
        long long crr = ca * x + cc * z;
        if (a + ca - (ca + cc) > 0 and c + cc - (ca + cc) > 0 and b - (ca + cc) > 0) {
          res = min(res, crr);
        }
      }
      swap(a, c);
      swap(x, z);
    }
    cout << (res < inf ? res : -1) << '\n';
  }
}