package Yukicoder

/**
 * Created by hichikawa on 2015/11/11.
 */
fun main(args: Array<String>) {
    val inputStr = readLine() as String
    var ans = 1
    for (c in inputStr) {
        if (c == 'L') ans = ans * 2
        else ans = ans * 2 + 1
    }
    println(ans)
}