#include <bits/stdc++.h>
using namespace std;
 
#define fi first
#define se second
#define pb push_back
using vi = vector <int>;
using ll = long long;
using pii = pair <int, int>;
const ll mod = 998244353;
//~ const ll mod = 1e9 + 7;
ll qpow(ll a, ll b, ll m = mod) { ll r = 1, t = a;
	for(; b; b /= 2) { if(b & 1) r = r * t % m; t = t * t % m; } return r; }

ll f(ll x, int c) {
	if(c == 0) return 0;
	return x + f(x / 2, c - 1);
}

int main() {
	ios :: sync_with_stdio(false);
	
	ll d; cin >> d;
	
	ll ans = d;
	for(int i = 1; i <= 64; i ++) {
		ll l = 0, r = d + 1;
		while(l + 1 < r) {
			ll m = (l + r) / 2;
			if(f(m - 1, i) >= d)
				r = m;
			else
				l = m;
		}
		
		if(f(l, i) == d)
			ans = min(ans, l);
	}
	
	cout << ans << '\n';
}