package no104;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] s = sc.next().toCharArray();
		int n = s.length;
		long x = 1;
		for(int i=0;i<n;i++) {
			if (s[i] == 'L') {
				x = x * 2;
			}else {
				x = x * 2 + 1;
			}
		}
		System.out.println(x);
	}

}