import java.util.*;

public class Main {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        try{
            String input=sc.next();
            String[] L_R=input.split("");
            int load=1;
            for(String curb:L_R){
                if(curb.equals("L")){
                    load*=2;
                }else{
                    load=load*2+1;
                }
            }
            System.out.println(load);
        }catch(Exception e){
            System.out.println(1);
        }
    }
}