#include<iostream>
#include<vector>
using namespace std;
vector<pair<int,int> >ask;
int N;
vector<int>now;
main()
{
	cin>>N;
	for(int i=1;i<=N;i++)now.push_back(i);
	while(now.size()>1)
	{
		vector<int>nxt;
		int i=0;
		for(;i+1<now.size();i+=2)
		{
			cout<<"? "<<now[i]<<" "<<now[i+1]<<endl;
			int t;
			cin>>t;
			nxt.push_back(t);
			ask.push_back(make_pair(now[i],now[i+1]));
		}
		if(i<now.size())nxt.push_back(now[i]);
		now=nxt;
	}
	int one=now[0];
	vector<int>ok;
	for(pair<int,int>p:ask)
	{
		if(p.first==one)ok.push_back(p.second);
		else if(p.second==one)ok.push_back(p.first);
	}
	int two=ok[0];
	for(int i=1;i<ok.size();i++)
	{
		cout<<"? "<<two<<" "<<ok[i]<<endl;
		cin>>two;
	}
	cout<<"! "<<two<<endl;
}