#include<iostream>
using namespace std;
main()
{
	long long int n,m,count=1;
	cin>>n;
	m=n;
	while(n!=1)
	{
		n/=2;
		count*=2;
	}
	if(m<=3.0*count/2.0)cout<<count<<endl;
	
	else if(m>3.0*count/2.0)cout<<count*2<<endl;
 }