// No.104 国道
package main

import (
	"fmt"
)

func main() {
	var s string
	fmt.Scanln(&s)

	ans := 1
	for i := 0; i < len(s); i++ {
		if string(s[i]) == "L" {
			ans = (ans * 2)
		}
		if string(s[i]) == "R" {
			ans = (ans * 2) + 1
		}
	}
	fmt.Println(ans)
}