#include<bits/stdc++.h>
// #include<atcoder/all>
using namespace std;
// using namespace atcoder;
using lint = long long;
using graph = vector<vector<int>>;
#define endl '\n'
lint const mod = 1e9+7;
//long const mod = 998244353;


int main(){
    
    lint n;
    cin >> n;
    int bit = 0;
    for(lint bitt = 1LL<<60;bitt>=1;bitt/=2){
        if(bitt & n){
            cout << bitt << endl;
            return 0;
        }
    }
}