using System.Collections.Generic;
using System;
using System.Linq;
using System.Drawing;


namespace yukicoder
{
    class Program
    {

        static void Main(string[] args)
        {

            string S = Console.ReadLine();
            string[] str = new string[S.Length];

            int num = 1;

            for (int i = 0; i < S.Length; i++)
            {
                str[i] = S.Substring(i, 1);
            }

            for(int j = 0; j < str.Length; j++)
            {
                if(str[j] == "L")
                {
                    num = num * 2;
                }
                else if (str[j] == "R")
                {
                    num = (num * 2) + 1;
                }
            }
            Console.WriteLine(num);
        }
    }
}