#include<bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < (int) n; i++)

using ll = long long;
using namespace std;

const long long INF = 1ll << 60;

int main() {
    ll n;
    cin >> n;
    ll j = -1;
    for (ll i = 59; i >= 0; i--) {
        if (n >> i & 1) {
            j = i;
            break;
        }
    }
    
    cout << (1ll << j) << endl;
}