I,P=input,print
S=set(range(int(I())))
G=S.pop
while len(S)>1:
	x,y=G(),G()
	P("?",x,y)
	z=int(I())
	if x==z:P("!",y),exit(0)
	if y==z:P("!",x),exit(0)
P("!",G())