#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll,ll>;
using ld=long double;
const ll INF=(1ll<<60);
#define rep(i,n) for (ll i=0;i<(ll)(n);i++)
#define all(v) v.begin(),v.end()
template<class T> inline bool chmin(T &a,T b){
    if(a>b){
        a=b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T &a,T b){
    if(a<b){
        a=b;
        return true;
    }
    return false;
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll n;
    cin >> n;
    ll ok=0,ng=n+1;
    ll cnt=0;
    while(1<abs(ok-ng)){
        ll mid=(ok+ng)/2;
        cnt++;
        cout << "? " << mid << endl;
        ll res;
        cin >> res;
        if(mid<=res) ok=mid;
        else ng=mid;
    }
    while(cnt<10){
        cout << "? 1" << endl;
        ll res;
        cin >> res;
        cnt++;
    }
    cout << "Yes " << ok << ' ' << ng << '\n';
}