package m.shin;
import java.util.Scanner;
public class Con104 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		String lr = s.nextLine();
		s.close();

		long now = 1;
		for(int i = 0;i < lr.length();i++){
			if(lr.charAt(i) == 'L'){
				now *= 2;
			}else{
				now *= 2;
				now++;
			}
		}
		System.out.println(now);

	}

}