#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll d;
bool ok(ll mid) {
	ll sum = 0;
	while (mid) {
		sum += mid;
		mid /= 2;
		if (sum >= d)return true;
	}
	return (sum >= d);
}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin >> d;
	ll left = 1, right = 1e18 + 7;
	for (int rep = 0; rep < 80; rep++) {
		ll mid = (left + right) / 2;
		if (ok(mid))right = mid;
		else left = mid;
	}
	cout << right << endl;
}