#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using Matrix = vector<vector<ll>>;
const int inf = 1000000000;
const ll INF = 1000000000000000000;
const ll mod = 998244353;
const ull mod_hash = (1UL << 61) - 1;
const vector<int> dx = {0, 1, 0, -1, 1, 1, -1, -1};
const vector<int> dy = {1, 0, -1, 0, 1, -1, 1, -1};

int main(){
  int N;cin>>N;
  int l = 1;
  int r = N;
  int q = 0;
  while((r - l) > 1){
    int mid = (l + r) >> 1;
    cout<<"? "<<mid<<endl;
    q++;
    int n;cin>>n;
    if(mid>n){
      r = mid;
    }else{
      l = mid;
    }
  }
  while(q<10){
    cout<<"? 1"<<endl;
    int n;cin>>n;
    q++;
  }
  cout<<"Yes "<<l<<" "<<r<<endl;
  return 0;
}