#include "bits/stdc++.h"
using namespace std;
#define print(x) cout<<x<<endl;
#define rep(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a) for(int i=0;i<a;i++)
typedef long long ll;
typedef pair<int, int> PI;
typedef pair<int, PI> V;
typedef vector<int> VE;
const ll mod = 100000000000;

using namespace std;

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