#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 D){
    for(int i = D/2, j = 0; i <= D && j <= 50000000; i++, j++){
        int sum = 0;
        int x = i;
        
        while(x){
            sum += x;
            if(sum == D) return i;
            x /= 2;
        }
    }
    for(int i = D * 11/20, j = 0; i <= D && j <= 50000000; i++, j++){
        int sum = 0;
        int x = i;
        
        while(x){
            sum += x;
            if(sum == D) return i;
            x /= 2;
        }
    }
    return D;
}

signed main(){
	cout<<fixed<<setprecision(10);
	
	int D;
    int ans = 0;
    
    cin>>D;

    cout<<cal(D)<<endl;
	
	return 0;
}