using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static long[] LList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => long.Parse(ReadLine())).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var min = 0;
        var icnt = 1;
        var max = n - 1;
        var acnt = n - 1;
        var rest = 10;
        var i = 0;
        var j = 0;
        while (true)
        {
            var mid = (max + min) / 2;
            WriteLine($"? {mid + 1}");
            var dcnt = NN;
            if (max - min == 2)
            {
                if (icnt == dcnt)
                {
                    i = min;
                    j = mid;
                }
                else
                {
                    i = mid;
                    j = max;
                }
                break;
            }
            if (mid - min == dcnt - icnt)
            {
                min = mid;
                icnt = dcnt;
            }
            else
            {
                max = mid;
                acnt = dcnt;
            }
            --rest;
        }
        while (rest > 0)
        {
            WriteLine("? 1");
            ReadLine();
            --rest;
        }
        WriteLine($"Yes {i + 1} {j + 1}");
    }
}