#include <iostream>
#include <sstream>
#include <math.h>
#include <stack>
#include <set>
#include <algorithm>
#include <string>
#include <queue>
#include <stack>
#include <map>
#include <cstdio>
#include <vector>
using namespace std;

#define INF (1 << 30)
#define INFLL (1LL << 60)

int main() {
	string str;
	cin >> str;
	long long int now = 1;
	for(int i = 0;i < str.size();i++){
		if(i == 0) {
			if(str[i] == 'L') now = 2;
			else now = 3;
		}else{
			if(str[i] == 'L') now = now * 2;
			else now = now * 2 + 1;
		}
	}
	cout << now << endl;
	return 0;
}