input_line = input()
i = 0
road_number = 1
try:
	while input_line[i] in input_line:
		if input_line[i] == "L":
			road_number = road_number*2
			i += 1
		else:
			road_number = road_number*2 + 1
			i += 1
except:
	print(road_number)