def bmin(a,b,c,x,y,z):
    Y,X = max(0,b+1-a), max(0,b+1-c)
    r = y*Y + x*X
    a -= X
    c -= Y
    b -= X+Y
    if a == c:
        a -= 1
        b -= 1
        r += min(x,y)
    if a <= 0 or b <= 0 or c <= 0: return INF
    return r

def bmax(a,b,c,x,y,z):
    r = 0
    if a==c:
        a -= 1
        b -= 1
        r += min(x,y)
    v = max(b,max(a,c)+1)-b
    a -= v
    c -= v
    if a <= 0 or b <= 0 or c <= 0: return INF
    return r+v*z


INF = 4*10**18
T = int(input())
for _ in range(T):
    a,b,c,x,y,z = map(int,input().split())
    p = bmin(a,b,c,x,y,z)
    q = bmax(a,b,c,x,y,z)
    ans = min(p,q)
    print(-1 if ans == INF else ans)