import java.util.*;
class y46 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int r = 1;
        for (int i=0; i<s.length(); i++) {
	        if (s.charAt(i)=='L')	r*=2;
        	else if (s.charAt(i)=='R')r=r*2+1;
        }
        System.out.println(r);
    }
}