#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max
#include <string>	//string
#include <ios>		//fixed
#include <iomanip>	//setprecision
#include <utility> //swap
#include <cstdlib>	//abs(int)
#include <sstream>	//stringstream,getline

using namespace std;

int main() {

	string S;
	cin >> S;

	long long int ans = 1;
	for (unsigned int i = 0; i < S.length(); i++) {
		if (S[i] == 'L') {
			ans = ans * 2;
		}
		else {
			ans = ans * 2 + 1;
		}
	}

	cout << ans << endl;

	return 0;

}