#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin
#include <ios>			//fixed
#include <iomanip>		//setprecision

using namespace std;

int main() {

	string S;
	cin >> S;

	long long int ans = 1;

	if (S.empty()) {
		cout << 1 << endl;
		return 0;
	}

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

	cout << ans << endl;

	return 0;

}