#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <map>
#include <list>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <iomanip>
#define INF 1050000000
#define SIZE 300
#define MOD 1000000007

using namespace std;


int main()
{
	string s;
	int res = 1;

	cin >> s;

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

	cout << res << endl;

	return (0);
}