#include <bits/stdc++.h>

using namespace std;
typedef pair<int, int> P;
typedef pair<P, P> P2;

int main() {
  string s;
  cin >> s;
  int n = s.size();
  int ans = 1;
  for (int i = 0; i < n; ++i) {
    if (s[i] == 'L') {
      ans *= 2;
    } else {
      ans *= 2;
      ans++;
    }
  }
  cout << ans << '\n';
  return 0;
}