aret = 0

# T = 10 ** 100
# d = 0
# while 2 ** (d + 1) <= T:
#     d += 1
# print(d)
# print(2 ** 332 <= T)
# print(2 ** 333 <= T)

for d in reversed(range(333)):
    print(f"? 1 {2 ** d}")

    s = input()
    if s == "<":
        continue

    ret += 2 ** d
    if s == "=":
        break

print(f"! {ret}")