import sys
input = sys.stdin.readline

x=1
y=1

for i in range(350,-1,-1):
    a=1
    b=1<<i

    print("?",a,b,flush=True)
    ret=input().strip()

    if ret=="=":
        y+=b
        break
    elif ret==">":
        y+=b

print("!",y//x,flush=True)