import java.io.*;

public class Yukicoder104 {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String s = br.readLine();
		int res = 1;
		for (int i = 0; i < s.length(); i++) res = s.charAt(i) == 'L' ? res * 2 : res * 2 + 1;
		System.out.println(res);
	}
}