#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n;
    cin >> n;
    int l = 1;
    int r = n;
    int cnt = 0;
    while(r-l>1) {
        int mid = (l+r)/2;
        cout << "? " << mid << endl;
        int ans;
        cin >> ans;
        if(ans<mid) r = mid;
        else l = mid; 
        cnt++;
    }
    while(cnt<10) {
        cout << "? " << 1 << endl;
        int a;
        cin >> a;
        cnt++;
    }
    cout << "Yes" << " " << l << " " << r << endl;
    return 0;
}