#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;
    for (int i = 0; i < 10; i++) {
        int mid = (l + r) / 2;
        cout << "? " << mid << endl;
        int c;
        cin >> c;
        if (c == mid) {
            l = mid;
        } else {
            r = mid;
        }
    }
    cout << "Yes " << l << " " << r << endl;
}