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

using ll = long long;
#define rep(i, n) for(ll i = 0; i < n; i++)

int main() {
	ll N;
	cin >> N;
	int b = __builtin_popcountll(N);
	ll ans = (1LL << b) - 2;
	cout << ans << endl;
}