using System;

public class Program
{
    public static void Main(string[] args)
    {
        var s = Console.ReadLine();

        int road = 1;
        for (int i = 0; i < s.Length; i++)
            road = (s[i].ToString() == "L") ? 2 * road : 2 * road + 1;
        
        Console.WriteLine(road);
    }
}