#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
template<class T> bool chmax(T &a, const T &b) { if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------

int N;
int step=0;
int ask(int a) {
	step++;
	cout<<"? "<<a<<endl;
	cin>>a;
	return a;
}
	

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N;
	x=ask(1);
	y=ask(N);
	int L=1,R=N;
	while(x!=y) {
		int M=(L+R)/2;
		k=ask(M);
		if(k==x) {
			R=M;
			y=k;
		}
		else if(k==y) {
			L=M;
			x=k;
		}
		else if(k-x<M-L) {
			L=M;
			x=k;
		}
		else {
			R=M;
			y=k;
		}
	}
	while(step<10) ask(1);
	cout<<"Yes "<<L<<" "<<R<<endl;
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}