import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String S = reader.readLine();
        int route = 1;
        for (int i = 0; i < S.length(); i++) {
            if (S.charAt(i) == 'L') {
                route = route * 2;
            } else {
                route = route * 2 +1;
            }
        }
        System.out.println(route);
    }
}