use proconio::input;

fn main() {
	input! {
		s: String,
	}

    if s.len() == 0 {
        println!("1");
        return;
    }

    let ans = s.chars()
        .fold(1, |acc, c| {
            match c {
                'L' => acc * 2,
                'R' => acc * 2 + 1,
                _ => unreachable!()
            }
        });

	println!("{ans}");
}