#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  int mn = 1, mx = n - 1;
  int l = 1, r = n;
  int rest = 10;
  while (r - l > 1) {
    rest--;
    int c = (l + r) / 2;
    cout << "? " << c << endl;
    int x;
    cin >> x;
    if (x - mn < c - l) {
      r = c;
      mx = x;
    } else {
      assert(mx - x < r - c);
      l = c;
      mn = x;
    }
  }
  rep(_, rest) {
    cout << "? 1" << endl;
    int x;
    cin >> x;
  }
  cout << "Yes " << l << ' ' << l + 1 << endl;
}