#include <bits/stdc++.h>
using namespace std;

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

	long long a = 0, b = 0;

	while (n > 0) {
		a += n;
		b = max(b, n * 2);
		n /= 2;
	}

	cout << b - a << endl;
}