import java.util.*;

class No0104{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();
		int now = 1;

		for(int i = 0; i < s.length(); i++){
			if(s.charAt(i) == 'L'){
				now *= 2;
			}else if(s.charAt(i) == 'R'){
				now = now * 2 + 1;
			}
		}
		System.out.println(now);
	}
}