public class No_104 {

	public static void main(String[] args) {
		java.util.Scanner sc = new java.util.Scanner(System.in);
		char[] LorR = sc.next().toCharArray();
		int root = 1;

		for (char c : LorR) {
			if (c == 'L')
				root *= 2;
			else if (c == 'R')
				root = root * 2 + 1;
		}

		System.out.println(root);
		sc.close();

	}

}