#include <vector>
#include <string>
#include <algorithm>
#include <numeric>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <utility>
#include <list>
#include <functional>
#include <queue>
#include <map>
#include <iterator>
#include <iomanip>
#include <complex>
using namespace std;

using ull = unsigned long long;
using ll = long long;


int main()
{
  string s;
  getline(cin,s);

  int result = 1;
  for(auto&& x : s)
  {
    if(x == 'L')
      result = result * 2;
    else
      result = result * 2 + 1;
  }

  cout << result << endl;
}