import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

"""
A / B < 10 ** 10 + 1

A / B >= k

A >= B * k か判定

A = A - B * k


A < B * k

10, 3
5 5
"""
M = 310
# M = 4

ans = 0
for i in range(M-1, -1, -1):
    print("?", 1, 1 << i, flush=True)
    x = input()
    if x != "<":
        ans += 1 << i

print("!", ans, flush=True)