import java.util.Scanner;

public class Highway {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String S = scanner.nextLine();
        String[] strArray = S.split("");
        int number = 1;
        if (strArray.length == 0) {
            System.out.println(number);
            return;
        }
        for (String s : strArray) {
            if (s.equals("L")) {
                number = number * 2;
            }
            if (s.equals("R")) {
                number = number * 2 + 1;
            }
        }
        System.out.println(number);
    }
}