#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll d;
ll ok(ll mid, int k) {
	ll sum = 0;
	while (k--) {
		sum += mid;
		mid /= 2;
	}
	return sum;
}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin >> d;
	ll ans = 1e18;
	for (int i = 0; i < 68; i++) {
		ll left = 0, right = d;
		for (int rep = 0; rep < 60; rep++) {
			ll mid = (left + right) / 2;
			ll got = ok(mid, i);
			if (got >= d)right = mid;
			else left = mid;
		}
		if (ok(right, i) == d) {
			ans = min(ans, right);
		}
	}
	cout << ans << endl;
}