#include <iostream>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstdlib>
#include <cassert>
#include <vector>
#include <list>
#include <stack>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <bitset>
#include <string>
#include <algorithm>
#include <utility>
#define rep(x, s, t) for(llint (x) = (s); (x) <= (t); (x)++)
#define chmin(x, y) (x) = min((x), (y))
#define chmax(x, y) (x) = max((x), (y))
#define all(x) (x).begin(),(x).end()
#define inf 1e18

using namespace std;

typedef long long llint;
typedef pair<llint, llint> P;

llint d;

llint check(llint x, llint p)
{
	llint ret = 0;
	rep(i, 0, p){
		ret += x;
		x /= 2;
	}
	return ret;
}

int main(void)
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> d;
	
	llint ans = 2e18;
	rep(i, 0, 60){
		llint ub = d, lb = 0, mid;
		while(ub-lb>1){
			mid = (ub+lb)/2;
			if(check(mid, i) >= d) ub = mid;
			else lb = mid;
		}
		if(check(ub, i) == d) chmin(ans, ub);
	}
	cout << ans << endl;
	
	return 0;
}