import sys
import math

X=10**100
Y=1
step = 0
while Y*2<X:
	Y*=2
	step += 1

sum = 0
while Y > 1:
	print("? 1 %d" % Y)
	ret = input()
	if ret != "<":
		sum += Y
	Y /= 2
print("! %d" % sum)