#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000005

long long get(long long a,long long b){
	long long ret = a;
	
	rep(i,b){
		ret += a>>(i+1);
	}
	return ret;
}

int main(){

	long long D;
	cin>>D;
	
	long long ans = D;
	//cout<<get(6,2)<<endl;
	for(long long i=1;i<=60;i++){
		long long ng = 0LL,ok = 1e18+5;
		
		while(ok-ng>1){
			long long mid = (ok+ng)/2;
			if(get(mid,i)>=D)ok = mid;
			else ng = mid;
		}
		if(get(ok,i)==D)ans = min(ans,ok);
	}
	
	cout<<ans<<endl;
	

	return 0;
}