import java.util.Scanner;

class No_104 {
	public static void main(String args[]) {
		Scanner stdIn = new Scanner(System.in);		

		String road = stdIn.nextLine();
		if (road.equals("")) {
			System.out.println(1);
			System.exit(0);
		}
		String[] lr = road.split("");

		int N = 1;
		for (int i = 0; i < lr.length; i++) {
			if ( lr[i].equals("L")) {
				N *= 2;	
			} else {
				N = (N * 2) + 1;
			}
		}
		System.out.println(N);
	}
}