import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		long ans=1;
		String str=sc.next();
		for(int i=0;i<str.length();i++){
			if(str.charAt(i)=='L') ans*=2;
			else if(str.charAt(i)=='R') ans=2*ans+1;
		}
		System.out.println(ans);
	}
}