#include <iostream>

using namespace std;

int main(int argc, const char* argv[])
{
	size_t N;
	cin >> N;
	size_t normal = 0;
	size_t ideal  = 0;
	size_t tmp	= N;
	while (tmp > 0) {
		if (ideal < normal + tmp * 2) {
			ideal = normal + tmp * 2;
		}
		normal += tmp;
		tmp >>= 1;
	}
	cout << ideal - normal << endl;
	return 0;
}