#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;
    int mx=1;
    for(int i=2; i<=n; i++){
        cout<<"? "<<i<<" "<<mx<<endl;
        int ret;
        cin>>ret;
        if(ret==i) mx=i;
    }
    int ans=1;
    if(mx==1) ans=2;
    for(int i=1; i<=n; i++){
        if(i==mx || i==ans) continue;
        cout<<"? "<<i<<" "<<ans<<endl;
        int ret;
        cin>>ret;
        if(ret==i) ans=i;
    }
    cout<<"! "<<ans<<endl;
    return 0;
}