#define _USE_MATH_DEFINES #include <cmath> #include <cstdio> #include <vector> #include <iostream> #include <algorithm> #include <string> #include<math.h> #include<iomanip> #include<stdio.h> #include <stdlib.h> #include<stdio.h> #include <queue> #include<map> #include <fstream> #include <sstream> #include<set> #include<stack> #include<time.h> #include <sys/types.h> #include <tuple> #include <numeric> #include <iterator> typedef long long int ll; //#include<bits/stdc++.h> using namespace std; int main() { int Q; Q = 1; //cin >> Q; while (Q--) { ll n = 1; string p; cin >> p; for (int i = 0; i < p.size(); i++) { n *= 2; if (p[i] == 'R')n++; } cout << n; } return 0; }