import java.util.Scanner;
	

public class Main{
	
	
	public static void main(String args[])throws Exception{
		try{
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		int pla = 1;
		for(int i=0;i<S.length();i++){
			if(S.charAt(i)=='L'){
				pla *= 2;
			}else{
				pla = pla * 2 + 1;
			}
		}
		System.out.println(pla);
		}catch(Exception e){
			System.out.println(1);
		}
	}
	

}