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