#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;
    map<int, int> mp;
    while(r-l>1) {
        int mid = (l+r)/2;
        cout << "? " << mid << endl;
        int ans;
        cin >> ans;
        mp[mid] = ans;
        if(ans<=mid) r = mid;
        else l = mid; 
    }
    if(mp[l]==mp[r]) {
        cout << "Yes" << " " << l << " " << r << endl;
    }
    else{
        cout << "No" << endl;
    }
    return 0;
}