#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 = 1, r = n;
    int lcnt, rcnt;
    cout << "? " << 1 << endl;
    cin >> lcnt;
    cout << "? " << n << endl;
    cin >> rcnt;

    for (int i = 0; i < 8; i++) {
        int mid = (l + r) / 2;
        cout << "? " << mid << endl;
        int c;
        cin >> c;
        if (mid - l == c - lcnt) {
            l = mid;
            lcnt = c;
        } else {
            r = mid;
            rcnt = c;
        }
    }
    cout << "Yes " << l << " " << r << endl;
}