using System;

namespace _378
{
    class Program
    {
        static void Main(string[] args)
        {
            long n = long.Parse(Console.ReadLine());
            long ret = 0;
            while (n > 0)
            {
                ret += n % 2;
                n /= 2;
            }
            Console.WriteLine(ret);
        }
    }
}