L = 10 ** 6
T = int(input())
for _ in range(T):
	print('?', L, 0, flush = True)
	R1 = int(input())
	if R1 == -1:
		exit(0)
	print('?', L, L, flush = True)
	R2 = int(input())
	if R2 == -1:
		exit(0)
	N = (2 * R2 - 1) // (R2 - R1)
	print('!', N, flush = True)
	st = int(input())
	if st == -1:
		exit(0)