def query_ask(x):
    print(f"? {x}", flush=True)
    if DEBUG:
        return ANS <= x
    else:
        v = int(input())

def query_ans(x):
    print(f"! {x}", flush=True)
    

DEBUG = 1
if DEBUG:
    print("DEBUG MODE!")
    ANS = 10

from bisect import bisect_left

ans = bisect_left(range(10**2+1),1,key=query_ask)
query_ans(ans)