#include<bits/stdc++.h>
using namespace std;

#define all(v) v.begin(), v.end()
#define inf 1000000007
#define ll long long
#define mod107 1000000007

int main(){
	ll N;
	cin>> N;
	ll ans = 0;
	for(int i = 66;i >= 0;i--){
		if(N >> i & 1){
			ans = (1LL << i);
			break;
		}
	}
	cout << ans << endl;
}