import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.InputMismatchException;

public class NationalHighway {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        String string = scanner.next();
        int Road = 1;
        char[] NewString = string.toCharArray();
         
        for(int i = 0 ; i < string.length() ; i++){
            //System.out.print("test");
            if(NewString[i] == 'R'){
                Road = Road * 2 + 1;
            }else if(NewString[i] == 'L'){
                Road = Road * 2 ;
            }else{
                //何もしない
            }
        }
        System.out.println(Road);
            
    }
}