#line 1 "main.cpp"
#include <iostream>

using namespace std;
using lint = long long;

void solve() {
    lint n;
    cin >> n;

    for (int i = 60; i >= 0; --i) {
        if ((n >> i) & 1) {
            cout << (1LL << i) << "\n";
            return;
        }
    }
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    solve();

    return 0;
}