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

class Program
{
    static void Main()
    {
        // Console input
        var LR = Console.ReadLine().ToCharArray();
        int tmp = 1;

        for (var i = 0; LR.Length > i; i++)
        {
            if (LR[i] == 'L')
            {
                tmp = tmp + tmp;
            }
            else if (LR[i] == 'R')
            {
                tmp = tmp + tmp + 1;
            }
        }
        
        // Console output
        Console.WriteLine(tmp);
    }
}