def solve():
    a, b, c, x, y, z = map(int, input().split())
    abc = [a, b, c]
    xyz = [x, y, z]
    inf = 10 ** 20
    ans = inf
    
    for i1, i2, i3 in [[1, 0, 2], [1, 2, 0], [0, 2, 1], [2, 0, 1]]:
        a, x = abc[i1], xyz[i1]
        b, y = abc[i2], xyz[i2]
        c, z = abc[i3], xyz[i3]
        cost = 0
        if b >= a:
            cost += y * (b - a + 1)
            b = a - 1
        if c >= b:
            cost += z * (c - b + 1)
            c = b - 1
        if c > 0:
            ans = min(ans, cost)
    
    if ans == inf:
        print(-1)
    else:
        print(ans)

for _ in range(int(input())):
    solve()