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

int main(void)
{
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	long long int N;

	cin >> N;

	int cnt = 0;
	long long int temp = N;
	while(temp > 0)
	{
		if(temp%2==1)
		{
			cnt++;
		}
		temp/=2;
	}

	long long int res = (1LL << cnt) - 1;
	res = N - res;

	cout << res << '\n';
	
	return 0;
}