#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    ll n;
    cin >> n;

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

    return 0;
}