#include <bits/stdc++.h>
using namespace std;
using ll = long long;
void solve() {
	ll a, b, c, x, y, z, w;
	cin >> a >> b >> c >> x >> y >> z >> w;
	ll ans = 0;
	for (int sum = 0; sum <= (a + b + c) / 2; sum ++) {
		ll kj = sum * w;
		kj += max(0ll, sum - c) * (x - w);
		kj += max(0ll, sum - a) * (y - w);
		kj += max(0ll, sum - b) * (z - w);
		ll mm = max({w, x, y, z}) - w;
		kj += mm * sum;
		ans = max(ans, kj);
	}
	cout << ans << endl;
}
int main () {
	int T;
	cin >> T;
	while (T --) {
		solve();
	}
}