#include <bits/stdc++.h>
using namespace std;

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


    int n;
    cin >> n;
    int l = 1,r = n;
    for (int i = 0; i < 10; i++){
        int m = (r+l)/2;
        cout << "? " << m << endl;
        int x;
        cin >> x;
        if (m > x){
            r = m;
        } else{
            l = m;
        }
    }
    cout << "Yes " << l << " " << r << endl;
    

    return 0;
}