ans = 0
t = 1
N = 10**100
#a, b = 9, 9
def main(n, m):
    return n * a >= m * b
#ans0 = 0
E = []
while t <= N:
    E.append(t)
    t *= 2
for t in E[::-1]:
    print("?", 1, t)
    s = input()
    if s != "<":
        ans += t
    #if main(1, t):
    #    ans0 += t

print("!", ans)