using System;
    class Program {
        static void Main(string[] args) {
            double ans;
            string read = Console.ReadLine().Trim();
            if (read == "") {
                ans = 1;
            } else {
                string binary = read.Replace('L', '0').Replace('R', '1');
                ans = Math.Pow(2, binary.Length) + Convert.ToInt32(binary, 2);
            }
            Console.WriteLine(ans);
        }
    }