#include <iostream>
#include <cassert>
#include <vector>
#include <algorithm>
using namespace std;
using ll = long long;

int main() {
	ll n; 
	cin >> n;
	assert(1 <= n < (1LL << 30));
	
	int bcnt = 0;
	for (int i = 0; i < 30; ++i) {
		if (n & (1LL << i)) bcnt += 1;
	}
	bcnt -= 1;
	cout << (bcnt ? (1LL << bcnt) : 0) << endl;
}