#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#define popcount __builtin_popcount
using namespace std;
typedef long long int ll;
typedef pair<int, int> P;

int main()
{
    int n; cin>>n;
    cout<<"? 1 2"<<endl;
    int ret0; cin>>ret0;
    int mx, mx2;
    if(ret0==1) mx=1, mx2=2;
    else mx=2, mx2=1;
    for(int i=3; i<=n; i++){
        cout<<"? "<<i<<" "<<mx<<endl;
        int ret; cin>>ret;
        if(ret==i){
            mx2=mx;
            mx=i;
            continue;
        }
        cout<<"? "<<i<<" "<<mx2<<endl;
        cin>>ret;
        if(ret==i){
            mx2=i;
        }
    }
    cout<<mx2<<endl;
    return 0;
}