#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <iomanip>
#include <cctype>
using namespace std;
typedef long long ll;

int main()
{
	int p = 1;
	string s;
	cin >> s;
	for (int i = 0; i < static_cast<int>(s.size()); i++)
	{
		if (s[i] == 'L')p = p * 2;
		else p = p * 2 + 1;
	}
	cout << p << endl;
	return 0;
}