INF = 10**9

def f213(a,b,c,x,y,z):
    res = 0
    if a >= b:
        d = a - b + 1
        a -= d
        res += d * x
    if c >= a:
        d = c - a + 1
        c -= d
        res += d * z
    return res if c > 0 else INF

def f132(a,b,c,x,y,z):
    res = 0
    if c >= a:
        d = c - a + 1
        c -= d
        res += d * z
    if b >= c:
        d = b - c + 1
        b -= d
        res += d * y
    return res if b > 0 else INF

for _ in range(int(input())):
    a, b, c, x, y, z = map(int, input().split())
    ans = min(f213(a,b,c,x,y,z),f213(c,b,a,z,y,x),f132(a,b,c,x,y,z),f132(c,b,a,z,y,x))
    if ans == INF: ans = -1
    print(ans)