I,P=input,print
N=int(I())
x=y=0
if N==5:
	P("?",y,1)
	y=int(I())
	P("?",y,1)
	z=int(I())
	P("!",1-y if y<2 else 9-y-z),exit(0)
if N%2:
	P("?",y,y)
	y=int(I())
	if N==3:
		if x!=y:x=3-x-y
else:
	while N%2<1:
		P("?",y,y)
		y=int(I())
		N//=2
	x=y
N=N//2-1
while N:
	if N%2:
		P("?",x,y)
		x=int(I())
	N=N//2
	if N:
		P("?",y,y)
		y=int(I())
P("!",x)