using System;

public class Program {
	public static void Main(string[] args) {
		string s = Console.ReadLine();
		char[] c = new char[0];
		if (s != null) {
			c = s.ToCharArray();
		}
		
		int line = 1;
		for (int i = 0; i < c.Length; i++) {
			if (c[i].Equals('L')) {
				line += line;
			} else {
				line += line + 1;
			}
		}
		
		Console.WriteLine(line);
	}
}