#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)1e18;
constexpr long long MOD = 1'000'000'007; 

struct fast_io {
	fast_io(){
		std::cin.tie(nullptr);
		std::ios::sync_with_stdio(false);
	};
} fio;

int cal(int x, int n){
    int sum = 0;
    for(int i = 0; i < n; i++){
        if(x <= 0) return -1;
        sum += x;
        
        x /= 2;
    }
    
    return sum;
}

signed main(){
	cout<<fixed<<setprecision(10);
	
	int D;
    int ans = INF;
    
    cin>>D;
    
    for(int i = 1; i <= 60; i++){
        
        int l = 0, h = D+1, m;
        
        while(l + 1 < h){
            m = (l + h) / 2;
            
            if(cal(m, i) < D) l = m;
            else h = m;
        }
        
        if(cal(h, i) == D) ans = min(ans, h);
    }

    cout<<ans<<endl;
	
	return 0;
}