using System;
using static System.Console;

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;
            x = s;
            y = 1;
            z = 2;
            w = 3;
            var count = 0;
            for (var i = 0; i < n; ++i)
            {
                uint t = x ^ (x << 11);
                x = y;
                y = z;
                z = w;
                w = w ^ (w >> 19) ^ t ^ (t >> 8);
                if (w <= mid) ++count;
            }
            if (n / 2 < count) ok = mid;
            else ng = mid;
        }
        WriteLine(ok);
    }
    static uint x = 0;
    static uint y = 1;
    static uint z = 2;
    static uint w = 3;
}