// #pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
// #include <x86intrin.h>
using namespace std;
#if __cplusplus >= 202002L
using namespace numbers;
#endif



int main(){
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(ios::badbit | ios::failbit);
	int n;
	cin >> n;
	auto query = [&](int i)->int{
		cout << "? " << i << endl;
		int x;
		cin >> x;
		return x;
	};
	int l = 1, r = n, lx = 1, rx = n - 1, cnt = 0;
	while(r - l >= 2){
		++ cnt;
		int m = l + r >> 1;
		int mx = query(m);
		if(mx - lx < m - l){
			l = m;
			lx = mx;
		}
		else{
			r = m;
			rx = mx;
		}
	}
	while(cnt < 10){
		query(1);
		++ cnt;
	}
	cout << "Yes " << l << " " << r << "\n";
	return 0;
}

/*

*/