#include <iostream>
#include <vector>

using namespace std;

int win[301];

int main(){
    int N;
    cin >> N;
    int s;
    while(true){
        vector<int> v, u;
        for(int i = 1; i <= N; i++){
            if(win[i] == 0) v.push_back(i);
        }
        for(int i = 0; i+1 < v.size(); i+= 2){
            cout << "? " << v[i] << ' ' << v[i+1] << endl;
            int n;
            cin >> n;
            if(v[i] == n) win[v[i+1]] = v[i];
            else win[v[i]] = v[i+1];
        }
        int cnt = 0;
        for(int i = 1; i <= N; i++){
            if(win[i] == 0) {
                cnt++;
                s = i;
            }
        }
        if(cnt == 1) break;
    }
    vector<int> v;
    win[s] = -1;
    for(int i = 1; i <= N; i++){
        if(win[i] == s) win[i] = 0;
    }
    while(true){
        vector<int> v, u;
        for(int i = 1; i <= N; i++){
            if(win[i] == 0) v.push_back(i);
        }
        for(int i = 0; i+1 < v.size(); i+= 2){
            cout << "? " << v[i] << ' ' << v[i+1] << endl;
            int n;
            cin >> n;
            if(v[i] == n) win[v[i+1]] = v[i];
            else win[v[i]] = v[i+1];
        }
        int cnt = 0;
        for(int i = 1; i <= N; i++){
            if(win[i] == 0) {
                cnt++;
                s = i;
            }
        }
        if(cnt == 1) break;
    }
    cout << "! " << s << endl;
}