#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<vector<ll>> vvll;
const ll inf = 1e16;
const ll md = 1000000007;

int main() {
  string s;
  cin>>s;
  int ans=1;
  for(char c:s){
    if(c=='L') ans*=2;
    else ans=ans*2+1;
  }
  cout<<ans<<endl;
  return 0;
}