using System.Globalization;

public class Program
{
    public static void Main()
    {
        int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;


        double a = Math.Pow(2, num);

        int b = (int)a-1;
        int count = 0;
        string h = Convert.ToString(b,2);
        for(int i = 0;i< h.Length;i++)
        {
            if (h[i] == '1')
            {
                count++;
            }
        }
        Console.WriteLine(count);
    }
}