#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){

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

    return 0;
}