using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int nn=1;
            var va = Console.ReadLine().ToList();
            va.ForEach(c => nn = c == 'L' ? nn * 2 : nn * 2 + 1);
            Console.WriteLine(nn);
            Console.ReadLine();
        }
    }
}