import sys
ans = 1
res = 1
for cnt in xrange(100):
    print "? %d" % (ans | 1 << (100 - cnt))
    sys.stdout.flush()
    res = int(raw_input())
    if res == 1:
        ans |= 1 << (100 - cnt)

print "! %d" % res
sys.stdout.flush()