package main

import (
	"fmt"
)

func main() {
	var n string
	count := 1
	fmt.Scanln(&n)
	for i := 0; i < len(n); i++ {
		if n[i:i+1] == "R" {
			count += count + 1
		} else if n[i:i+1] == "L" {
			count += count
		}
	}
	fmt.Println(count)
}