#include <iostream>
#include <string>
using namespace std;

int main()
{
	string S;
	cin >> S;
	int answer = 1;

	for(int i = 0; i < S.length(); ++i)
	{
		answer = ((S[i] == 'L') ? answer * 2 : answer * 2 + 1);
	}

	cout << answer << endl;

	return 0;
}