import java.util.Scanner;

class C{
	public static void main(String[]$){
		int v=1;
		Scanner s=new Scanner(System.in);
		if(s.hasNext())
		for(char c:s.next().toCharArray()) {
			if(c=='L')v*=2;
			if(c=='R')v+=v+1;
		}
		System.out.println(v);
	}
}