T = gets.to_i

def f1(a, b, c, x, y, z)
  cost = 0

  if a >= b
    diff = a - b + 1
    cost += x * diff
    a -= diff
  end

  if b <= c
    diff = c - b + 1
    cost += z * diff
    c -= diff
  end

  if a <= c
    diff = c - a + 1
    cost += z * diff
    c -= diff
  end

  return Float::INFINITY if a <= 0
  return Float::INFINITY if c <= 0

  cost
end

def f2(a, b, c, x, y, z)
  cost = 0

  if a >= b
    diff = a - b + 1
    cost += x * diff
    a -= diff
  end

  if b <= c
    diff = c - b + 1
    cost += z * diff
    c -= diff
  end

  if a >= c
    diff = a - c + 1
    cost += x * diff
    a -= diff
  end

  return Float::INFINITY if a <= 0
  return Float::INFINITY if c <= 0

  cost
end

def f3(a, b, c, x, y, z)
  cost = 0

  if a <= c
    diff = c - a + 1
    cost += z * diff
    c -= diff
  end

  if a <= b
    diff = b - a + 1
    cost += y * diff
    b -= diff
  end

  if b >= c
    diff = b - c + 1
    cost += y * diff
    b -= diff
  end

  return Float::INFINITY if b <= 0
  return Float::INFINITY if c <= 0

  cost
end

def f4(a, b, c, x, y, z)
  cost = 0

  if a >= c
    diff = a - c + 1
    cost += x * diff
    a -= diff
  end

  if a <= b
    diff = b - a + 1
    cost += y * diff
    b -= diff
  end

  if b >= c
    diff = b - c + 1
    cost += y * diff
    b -= diff
  end

  return Float::INFINITY if b <= 0
  return Float::INFINITY if a <= 0

  cost
end

T.times do
  a, b, c, x, y, z = gets.split.map(&:to_i)

  res = [f1(a, b, c, x, y, z), f2(a, b, c, x, y, z), f3(a, b, c, x, y, z), f4(a, b, c, x, y, z)].min

  if res == Float::INFINITY
    puts -1
  else
    puts res
  end
end