#include<bits/stdc++.h>
//#include<atcoder/all>
//using namespace atcoder;
using namespace std;
using ll = long long;


int main(){
	ll n;
	cin >> n;
	int i=0;
	for(;n;i++){
		n/=2;
	}
	cout<<(1LL<<(i-1))<<endl;
}