import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

T = int(readline())
m = map(int,read().split())
ABCXYZ = zip(m,m,m,m,m,m)
INF = 10 ** 30

def type_231(A,B,C,X,Y,Z):
    a = B - 1
    if a > A:
        a = A
    c = a - 1
    if c > C:
        c = C
    if c <= 0:
        return INF
    return (A - a) * X + (C - c) * Z

def type_213(A,B,C,X,Y,Z):
    a = C - 1
    if a > A:
        a = A
    b = a - 1
    if b > B:
        b = B
    if b <= 0:
        return INF
    return (A - a) * X + (B - b) * Y

def solve(A,B,C,X,Y,Z):
    x = min(
        type_231(A,B,C,X,Y,Z), type_231(C,B,A,Z,Y,X),
        type_213(A,B,C,X,Y,Z), type_213(C,B,A,Z,Y,X))
    return x if x < INF else -1

answer = [solve(*args) for args in ABCXYZ]
print('\n'.join(map(str,answer)))