import java.io.*;

public class No104{
    public static void main(String[] args) throws IOException{
        String str = new BufferedReader(new InputStreamReader(System.in)).readLine();
        if(str == null){
            System.out.println(1);
            return;
        }
        else{
            char[] direction = str.toCharArray();
            long roadNum = 1;
            System.out.println(calc(roadNum, direction));
        }
    }
     
    public static long calc(long a, char[] b){
        for(int i=0; i < b.length; i++){
            if(b[i] == 'R') a = (a * 2) + 1;
            if(b[i] == 'L') a *= 2;
        }
        return a;
    }
}