using System;

class S24_route{
  public static int Main(string[] args){
    char[] c = new char[30];
    int route = 1;
    c = Console.ReadLine().ToCharArray();

    for(int i = 0; i < c.Length; i++){
      if('L'.Equals(c[i])){
        route *= 2;
      }else{
        route *= 2;
        route += 1;
      }
    }

    Console.WriteLine("{0}",route);
    return 0;
  }

}