using System;

namespace Problem047
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            var ans = Process(n, 0, 1);
            Console.WriteLine(ans);
            Console.ReadKey();
        }

        static int Process(int n, int biskets, int in_pocket, int depth = 0)
        {
            if (biskets == n) return depth;

            biskets += in_pocket * 2;
            var remain = n - biskets;
            var next_pocket = Math.Min(remain, biskets);
            return Process(n, biskets - next_pocket, next_pocket, depth + 1);
        }
    }
}