/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2021.02.05 21:38:13
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    ll n;cin >> n;
    ll ans = (1LL<<60);
    while(!(ans & n)) {
        ans >>= 1;
    }
    cout << ans << endl;
    return 0;
}