#include <iostream>
#include <map>
#include <vector>
#include <queue>
#include <utility>
#include <set>
#include <stdlib.h>
#define llint long long
#define inf 1e18

using namespace std;
typedef pair<llint, llint> P;

llint n;
vector<int> vec, win[305];

void calc()
{
	int res;
	vector<int> tmp;
	for(int i = 0; i+1 < vec.size(); i+=2){
		cout << "? " << vec[i] << " " << vec[i+1] << endl;
		cin >> res;
		tmp.push_back(res);
		if(res == vec[i]) win[vec[i]].push_back(vec[i+1]);
		if(res == vec[i+1]) win[vec[i+1]].push_back(vec[i]);
	}
	if(vec.size() % 2) tmp.push_back(vec.back());
	vec = tmp;
}

int main(void)
{
	cin >> n;
	for(int i = 1; i <= n; i++) vec.push_back(i);
	
	while(vec.size() > 1) calc();
	int winner = vec[0];
	
	vec.clear();
	for(int i = 0; i < win[winner].size(); i++) vec.push_back(win[winner][i]);
	while(vec.size() > 1) calc();
	cout << "! " << vec[0] << endl;
	
	return 0;
}