th = pow(10, 100)
v = 1
cnt = 0
while v <= th:
    v <<= 1
    cnt += 1
v = v >> 1
cnt -= 1
ans = 0
while v >= 1:
    print('?', 1, v)
    c = input()
    if c == '>' or c == '=':
        ans += 1 << cnt
    cnt -= 1
print('!', cnt)