<?php
$point = str_split(trim(fgets(STDIN)));
// print_r($point);
$answer = 1;
foreach ($point as $key => $value){
    if ($point[$key] == "L"){
        $answer = $answer * 2; 
    } elseif ($point[$key] == "R") {
        $answer = $answer * 2 + 1;
    } else {
        $answer = "1";
    }
}
echo $answer;