#include<bits/stdc++.h>
using namespace std;
const int N = 2e5+10;
#define int long long
map<int,int>mp;
int n,t(0),g(0),cnt(1),l,r;
int ask(){
	while(mp[cnt])cnt++;
	cout<<"? "<<cnt<<endl;
	l=cnt+1;
	mp[cnt]++;
	cout.flush();
	cin>>g;
	if(g==t)return 1;
	t=g;
	return 0;
}
signed main(){
	cin>>n;
	l=1,r=n;
	if(ask()){
		cout<<"! "<<cnt<<endl;
		return 0;
	}
	while(1){
		cout<<"? "<<(l+r>>1)<<endl;
		cout.flush();
		cin>>g;
//		cout<<g<<" "<<t<<endl;
		if(g>t){
			l ...

Invalid Configuration File: failed to read Nin and Nout