using System;
using System.IO;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Numerics;
using System.Diagnostics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;
using static System.Console;


namespace yukicoder
{
    class Program
    {
        static void Main()
        {
            var s = Console.ReadLine();
            var cnt = 1;

            for (var i = 0; i < s.Length; i++)
            {
                if (s[i] == 'L')
                {
                    cnt *= 2;
                }
                else
                {
                    cnt = cnt * 2 + 1;
                }
            }

            Console.WriteLine(cnt);

        }
        
    }
}