import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No00000104_Main {

	public static void main(String[] args) throws IOException {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String[] arr = br.readLine().split("");
		int rootNo = 1;
		for(int i = 0; i < arr.length ; i++) {
			if("L".equals(arr[i])) {
				rootNo = 2 * rootNo;
			} else if("R".equals(arr[i])) {
				rootNo = 2 * rootNo + 1;
			}
		}

		System.out.println(rootNo);

	}

}