import java.util.Scanner;

class S24_route{
  public static void main(String[] args){
    int route = 1;
    String c[] = new String[30];
    Scanner scn = new Scanner(System.in);

    c = scn.next().split("");

    for(int i = 0; i < c.length; i++){
      if("L".equals(c[i])){
        route *= 2;
      }else{
        route *= 2;
        route += 1;
      }
    }

    System.out.println(route);

  }
}