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

namespace yuki
{
    class Program
    {
        static void Main(string[] args)
        {
            char[] S = Console.ReadLine().ToCharArray();
            int r = 1;

            foreach (var c in S)
            {
                if (c == 'L') r *= 2;
                else r = r * 2 + 1;
            }

            Console.WriteLine(r);
        }
    }
}