import java.util.Scanner;

class Test {
	public static void main(String[] args) throws Exception {
		Scanner in = new Scanner(System.in);

		char[] s = in.next().toCharArray();
		int n = 1;
		if(s.length == 0) System.out.println(1);
		for(int i=0; i<s.length; i++) {
			if(s[i] == 'L') {
				n += n;
			}
			if(s[i] == 'R') {
				n = n + n + 1;
			}
		}

		System.out.println(n);
	}
}