#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define riano_ std::ios::sync_with_stdio(false);std::cin.tie(nullptr)

int main() {
    riano_;
	ll N; cin >> N;
    ll l = 1,r = N-1,sl,sr;
    cout << "? " << l << endl;
    cin >> sl; sl = sl*2-1;
    cout << "? " << r << endl;
    cin >> sr; sr = sr*2-(N-1);
    if(sl==sr){
        cout << "! " << l+1 << " " << r << endl;
        return 0;
    }
    int pm = 1;
    if(sl>0) pm = -1;
    while(l<r){
        ll c = (l+r)/2;
        cout << "? " << c << endl;
        cin >> sl; sl = sl*2-c;
        if(sl==0){
            l = c; r = c;
        }
        else if(sl*pm<0){
            l = c;
        }
        else r = c;
    }
    if(l>=N/2){
        cout << "! " << 1 << " " << l << endl;
    }
    else{
        cout << "! " << l+1 << " " << N << endl;
    }
}