I,P,E=input,print,exit
N=int(I())
y=0
if N==3:
	P("?",0,0)
	y=int(I())
	P("!",y*2%3),E(0)
if N==5:
	P("?",1,0)
	y=int(I())
	P("?",y,0)
	z=int(I())
	P("!",1-y if y<2 else y if z<1 else 9-y-z),E(0)
if N==7:
	P("?",1,0)
	y=int(I())
	P("?",y,0)
	z=int(I())
	P("?",z,y)
	w=int(I())
	P("!",1-y if y<2 else y if z<1 else z if w<1 else 20-y-z-w),E(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)