#include <bits/stdc++.h>
using namespace std;

int main() {
  string S;
  cin >> S;
  int s = 1 << S.size();
  int l = s, r = s * 2 - 1;
  for (int i = 0; i < S.size(); i++) {
    if (S.at(i) == 'L') r -= (r - l) / 2 + 1;
    else l += (r - l) / 2 + 1;
  }
  cout << l << "\n";
}