import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String s [] = S.split("");
        String n = "";
        if( !sc.hasNext() ){
            System.out.println(1);
        }else{
            for(int i=0; i<s.length; i++){
                if( "R".equals(s[i]) ){
                    n = n + "1";
                }else if( "L".equals(s[i]) ){
                    n = n + "0";
                }
            }
            int a = Integer.parseInt(n, 2);
            int b = (int)Math.pow(2,s.length);
            int r = a+b;
            System.out.println(r);
        }
    }
}