#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <array>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
#include <memory>
#include <regex>
using namespace std;

int main()
{
    int n;
    cin >> n;

    queue<int> q;
    for(int i=1; i<=n; ++i)
        q.push(i);

    vector<vector<int> > edges(n+1);
    while(q.size() > 1){
        int a = q.front();
        q.pop();
        int b = q.front();
        q.pop();

        cout << "? " << a << ' ' << b << endl;
        int x;
        cin >> x;
        if(a == x){
            edges[a].push_back(b);
            q.push(a);
        }
        else{
            edges[b].push_back(a);
            q.push(b);
        }
    }

    int victory = q.front();
    q.pop();
    for(int x : edges[victory])
        q.push(x);

    while(q.size() > 1){
        int a = q.front();
        q.pop();
        int b = q.front();
        q.pop();

        cout << "? " << a << ' ' << b << endl;
        int x;
        cin >> x;
        if(a == x)
            q.push(a);
        else
            q.push(b);
    }
    cout << "! " << q.front() << endl;

    return 0;
}