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

class Program
{
    static uint NN => uint.Parse(ReadLine());
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var s = NN;
        var n = 10_000_001;
        var ok = 3_000_000_000L;
        var ng = 1_000_000_000L;
        while (ok - ng > 1)
        {
            var mid = (ok + ng) / 2;
            Init(s);
            var count = 0;
            for (var i = 0; i < n; ++i)
            {
                var a = Next();
                if (a <= mid) ++count;
            }
            if (n / 2 < count) ok = mid;
            else ng = mid;
        }
        WriteLine(ok);
    }
    static void Init(uint seed)
    {
        x = seed;
        y = 1;
        z = 2;
        w = 3;
    }
    static uint x = 0;
    static uint y = 1;
    static uint z = 2;
    static uint w = 3;
    static uint Next()
    {
        uint t = x ^ (x << 11);
        x = y;
        y = z;
        z = w;
        w = w ^ (w >> 19) ^ t ^ (t >> 8);
        return w;
    }
}