#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
}
int main() {
    fast_io();
    int n;
    cin >> n;
    int l = 0, r = n + 1;
    int cnt = 0;
    while (l + 1 < r) {
        int mid = (l + r) / 2;
        cout << "? " << mid << endl;
        int c;
        cin >> c;
        if (c == mid) {
            l = mid;
        } else {
            r = mid;
        }
    }
    assert(l + 1 == r);
    while (cnt < 10) {
        cnt++;
        cout << "? " << l << endl;
        int c;
        cin >> c;
    }
    cout << "! " << l << " " << r << endl;
}