import java.util.Scanner;
public class Main{
	public static void main(String args[])throws Exception{
		Scanner sc=new Scanner(System.in);
		int counter=1;
		char c[]=sc.nextLine().toCharArray();
		for(int i=0;i<c.length;i++){
			if(c[i]=='L')
				counter=counter*2;
			else if(c[i]=='R')
				counter=counter*2+1;
		}
		System.out.println(counter);
	}
}