#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<map>
#define all(x) x.begin(),x.end()
#define pb push_back
#define ll long long 
#define P pair<int,int>
#define LP pair<ll,ll>
using namespace std;
int main() {
	vector<int> dp(40);
	string s;
	cin >> s;

	if (s[0] == 'L') dp[0] = 2;
	else if (s[0] == 'R') dp[0] = 3;
	else cout << 1 << endl;

	for (int i = 1; i < s.size(); i++) {
		if (s[i] == 'L') dp[i] = 2*dp[i - 1] ;
		else dp[i] = 2*dp[i - 1] + 1;
	}

	cout << dp[s.size()-1]<<endl;
	return 0;
}