//interactive
ll@n,@m,@l;
ll a=0,b=1d9;
while(a+1<b){
	ll m=a+b>>1;
	wt("?",m,1);
	ll@r;
	if(r<m){
		b=m;
	}else{
		a=m;
	}
}
wt("!",powmod(n,powmod(m,l,EulerPhi(b)),b));