#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;

int main()
{
	long long N; cin >> N;

	long long ans = N;
	int cnt = 0;
	while (N) {
		if (N & 1)cnt++;
		N >>= 1;
	}
	ans -= ((long long)1 << cnt) - 1;
	cout << ans << endl;

	return 0;
}