#include <bits/stdc++.h>

#include <atcoder/all>
using namespace std;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
#define FAST_IO                \
  ios::sync_with_stdio(false); \
  cin.tie(0);
const i64 INF = 1001001001001001001;
using Modint = atcoder::static_modint<998244353>;

int ask(int i) {
  cout << "? " << i << endl;
  int ret;
  cin >> ret;
  return ret;
}

void answerYes(int i, int j) {
  cout << "Yes " << i << " " << j << endl;
}

void answerNo() {
  cout << "No" << endl;
}

int main() {
  FAST_IO

  // 1 2 3 4 5 6 7 8
  // 1 1 2 3 4 5 6 7
  int N;
  cin >> N;

  int l = 0;
  int r = N;
  while (r - l > 1) {
    int m = (l + r) / 2;
    int a = ask(m);
    if (a == m) {
      l = m;
    } else {
      r = m;
    }
  }
  if (l == 0) {
    answerNo();
  } else {
    answerYes(l, r);
  }
}