#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;
	for(int i = 60;i >= 0;i--){
		if((N >> i) & 1){
			cout << (1LL << i) << endl;
			break;
		}
	}
}