#include <iostream>
using namespace std;


int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int ask = 0;

    auto rec = [&](auto &&self, int il, int nl, int ir, int nr) -> void {

        if (il + 1 == ir) {
            while (ask < 10) {
                ++ask;
                cout << "? 1" << endl;
            }
            cout << "Yes " << il << ' ' << ir << endl;
            exit(0);
        }

        ++ask;

        const int ic = (il + ir) / 2;
        cout << "? " << ic << endl;

        int resp = 0;
        cin >> resp;

        if (resp - nl < ic - il) {
            self(self, il, nl, ic, resp);
        } else {
            self(self, ic, resp, ir, nr);
        }
    };

    int N;
    cin >> N;
    rec(rec, 1, 1, N, N - 1);
}