#include "bits/stdc++.h"
using namespace std;
//#include "atcoder/all"
//using namespace atcoder;
#define int long long
#define REP(i, n) for (int i = 0; i < (int)n; ++i)
#define RREP(i, n) for (int i = (int)n - 1; i >= 0; --i)
#define FOR(i, s, n) for (int i = s; i < (int)n; ++i)
#define RFOR(i, s, n) for (int i = (int)n - 1; i >= s; --i)
#define ALL(a) a.begin(), a.end()
#define IN(a, x, b) (a <= x && x < b)
template<class T>istream&operator >>(istream&is,vector<T>&vec){for(T&x:vec)is>>x;return is;}
template<class T>inline void out(T t){cout << t << "\n";}
template<class T,class... Ts>inline void out(T t,Ts... ts){cout << t << " ";out(ts...);}
template<class T>inline bool CHMIN(T&a,T b){if(a > b){a = b;return true;}return false;}
template<class T>inline bool CHMAX(T&a,T b){if(a < b){a = b;return true;}return false;}
constexpr int INF = 1e18;

signed main(){
	int D;
	cin >> D;
	int ans = INF;
	REP(i, 70) {
		auto f =[&](int x){
			int ret = 0;
			REP(j, i + 1) {
				ret += x;
				x /= 2;
			}
			return ret >= D;
		};
		int l = -1, r = 1e18 + 1;
		while(r - l > 1){
			int c = (l + r) / 2;
			if(f(c)) r = c;
			else l = c;
		}
		int x = r;
		int s = 0;
		REP(j, i + 1) {
			s += x;
			x /= 2;
		}
		if(s != D) continue;
		CHMIN(ans, r);
	}
	out(ans);
}