#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,i=1;
	cin>>n;
	while(i<n){
		i*=2;
	}
	i/=2;
	if(i*2-n<n-i){
		cout<<i*2;
	}else{
		cout<<i;
	}
	return 0;
}
/**************************************************************
	Problem: 1075
	User: zzz
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/