package main
import "fmt"
func main () {
    var route string
	fmt.Scanln(&route)
	var whr int = 1
	for _, dir := range route{
		if dir == 'L' {
			whr = whr * 2
		} else if dir == 'R' {
			whr = whr*2 + 1
		}
	}
	fmt.Println(whr)
}