#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using namespace std;

int main()
{
    long long n, maxbit = 0;
    cin >> n;
    bitset<60> s(n);
    vector<long long> sn;
    for (int i = 0; i < 60; i++){
        if (s.test(i)) maxbit = i;
    }
    cout << fixed << setprecision(0) << pow(2, maxbit) << endl;
}