#include<iostream>
#include<string>

int main() {
	std::string str;

	std::getline(std::cin, str);

	int road = 1;
	for (int i = 0; i < str.length(); i++) {
		if (str[i] == 'L') {
			road *= 2;
		} else {
			road = road * 2 + 1;
		}
	}

	std::cout << road << std::endl;
	return 0;
}