#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,x,y,k;
	cin>>k;
	n=k;
	while(n!=1){
		n/=2;
		x*=2;
	}
	y=x*2;
	if(n-x<=y-n)
	cout<<x;
	else
	cout<<y;	
	return 0;
}
/**************************************************************
	Problem: 1075
	User: houshanglin
	Language: C++
	Result: Wrong Answer
****************************************************************/