#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
}

int query(int x) {
    cout << "? " << x << endl;
    int cnt;
    cin >> cnt;
    return cnt;
}
int main() {
    fast_io();
    int n;
    cin >> n;
    int l = 1, r = n;
    int lcnt = query(l), rcnt = query(r);
    for (int i = 0; i < 8; i++) {
        if (l + 1 == r) {
            query(1);
            continue;
        }
        int mid = (l + r) / 2;
        int c = query(mid);
        if (c - lcnt < mid - l) {
            r = mid;
            rcnt = c;
        } else {
            l = mid;
            lcnt = c;
        }
    }
    cout << "Yes " << l << " " << r << endl;
}