#include <bits/stdc++.h>

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

vector<int> cnt;
int query(int x) {
    cout << "? " << x << endl;
    if (debug) {
        return cnt[x - 1];
    } else {
        int c;
        cin >> c;
        return c;
    }
}
int main() {
    fast_io();
    int t = 1;
    for (; t--;) {
        int n;
        if (debug) {
            n = 11;
        } else {
            cin >> n;
        }
        if (debug) {
            cnt.resize(n);
            uniform_int_distribution<int> dist(1, n - 1);
            random_device rd;
            mt19937 mt(rd());
            for (int i = 0; i < n; i++) {
                cnt[i] = dist(mt);
            }
            sort(cnt.begin(), cnt.end());
        }

        int l = 1, r = n;
        int lcnt = query(l);
        int rcnt = query(r);
        //[l, r]に同じ値が含まれる
        for (int i = 0; i < 8; i++) {
            if (l + 1 == r) {
                int c = query(l);
                continue;
            }
            int mid = (l + r) / 2;
            int c = query(mid);
            if (c - lcnt < mid - l) {
                r = mid;
                rcnt = c;
            } else {
                l = mid;
                lcnt = c;
            }
            assert(rcnt - lcnt < r - l);
        }
        assert(lcnt == rcnt);
        cout << "Yes " << l << " " << r << endl;

        if (debug) {
            if (cnt[l - 1] != cnt[r - 1]) {
                for (int i = 0; i < n; i++) {
                    cout << cnt[i] << " ";
                }
                cout << endl;
                assert(cnt[l - 1] == cnt[r - 1]);
            }
        }
    }
}