#include <iostream>
#include <string>
using namespace std;

int main() {
  string s;
  cin >> s;
  int n = 1;
  for (size_t i = 0; i < s.length(); i++) {
    if (s[i] == 'L') n = 2 * n;
    else if (s[i] == 'R') n = 2 * n + 1;
  }
  cout << n << endl;
}