#include<iostream>

using namespace std;

int main()
{
	cin.tie(0);
	ios::sync_with_stdio(false);

	char s[30];
	cin >> s;

	int RoNum = 1;

	for (int i = 0; s[i] != '\0'; i++){
		if (s[i] == 'L')
			RoNum *= 2;
		else
			RoNum = (RoNum * 2) + 1;
	}

	cout << RoNum << endl;
	
}