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

int btc(int64_t n) {
	int r = 0;
	for (; n; n >>= 1) {
		if (n & 1) {
			r++;
		}
	}
	return r;
}

int64_t pow(int64_t a, int n) {
	int64_t r = 1;
	for (; n; n >>= 1) {
		if (n & 1) {
			r *= a;
		}
		a *= a;
	}
	return r;
}

int main() {
	int64_t n;
	cin >> n;
	int64_t puni = pow(2, btc(n));
	cout << n - puni + 1 << endl;
	return 0;
}