/*No.104 国道*/
import java.io.*;
public class No104 {
	public static void main(String[] args) {
		try(BufferedReader input =new BufferedReader(new InputStreamReader(System.in))){
			String route =input.readLine();
			int walkway=1;
			for(byte i=0;i<route.length();i++){
				if(route.charAt(i)=='L'){
					walkway*=2;
				}else if(route.charAt(i)=='R'){
					walkway=2*walkway+1;
				}
			}
			System.out.println(walkway);
		}catch(Exception e){
			e.printStackTrace();
		}		
	}
}