#include <fstream>
using namespace std;
ifstream fin("fetite.in");
ofstream fout("fetite.out");
unsigned long long findPetal(const unsigned long long &N) {
if(N == 1)
return 1;
if(N %2==1)
return 2 * findPetal((N - 1) / 2) + 1;
return 2 * findPetal(N / 2) - 1;
}
int main() {
unsigned long long N;
fin >> N;
fout << findPetal(N) << '\n';
fin.close();
fout.close();
return 0;
}