T = int(input())

for i in range(T):

    a,b,c,x,y,z = map(int,input().split())
    A = 10**9-a
    B = 10**9-b
    C = 10**9-c

    Z = x
    Y = z
    X = y

    ans = float("inf")

    #A>C>B

    na = A
    nc = min(A-1,C)
    nb = min(nc-1,B)

    if min(a - (B-nb+C-nc) , b - (A-na+C-nc) , c - (B-nb+A-na)) > 0:
        ans = min(ans, (A-na)*X + (B-nb)*Y + (C-nc)*Z)

    #B>C>A
    nb = B
    nc = min(B-1,C)
    na = min(nc-1,A)

    if min(a - (B-nb+C-nc) , b - (A-na+C-nc) , c - (B-nb+A-na)) > 0:
        ans = min(ans, (A-na)*X + (B-nb)*Y + (C-nc)*Z)


    t = A
    A = C
    C = t
    s = X
    X = Z
    Z = s

    #A>C>B

    na = A
    nc = min(A-1,C)
    nb = min(nc-1,B)

    if min(a - (B-nb+C-nc) , b - (A-na+C-nc) , c - (B-nb+A-na)) > 0:
        ans = min(ans, (A-na)*X + (B-nb)*Y + (C-nc)*Z)
    #B>C>A
    nb = B
    nc = min(B-1,C)
    na = min(nc-1,A)

    if min(a - (B-nb+C-nc) , b - (A-na+C-nc) , c - (B-nb+A-na)) > 0:
        ans = min(ans, (A-na)*X + (B-nb)*Y + (C-nc)*Z)


    if ans == float("inf"):
        print (-1)
    else:
        print (ans)