#include <bits/stdc++.h>
using namespace std;
using ll = int_fast64_t;
constexpr int mod = 1e9 + 7;
constexpr int inf = (1 << 30) - 1;
constexpr ll infll = (1LL << 61) - 1;
#define fast() ios::sync_with_stdio(false), cin.tie(nullptr)
#define set_digit(N) cout << fixed << setprecision((N))
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

ll func(ll x, int k)
{
	ll sum = 0;
	for (int i = 0; i < k; i++)
	{
		sum += x;
		x /= 2;
	}
	return sum;
}

int main()
{
	ll D;
	cin >> D;

	vector<ll> ans;
	for (ll i = 0; i <= log2(D) + 1; i++)
	{
		ll ng = 0, ok = D;
		while (ok - ng > 1)
		{
			ll mid = (ok + ng) / 2;
			if (func(mid, i) >= D)
			{
				ok = mid;
			}
			else
			{
				ng = mid;
			}
		}
		if (func(ok, i) == D)
			ans.push_back(ok);
	}
	if (ans.empty())
	{
		cout << -1 << "\n";
	}
	else
	{
		cout << *min_element(ans.begin(), ans.end()) << "\n";
	}
}