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

int main() {
  string S;
  cin >> S;
  int ans = 1;
  for (unsigned i = 0; i < S.size(); ++i) {
    if (S[i] == 'L') {
      ans += ans;
    } else {
      ans += ans + 1;
    }
  }
  cout << ans << endl;
}