#include <iostream>
#include <cstdint>
#include <vector>
using ll = std::uint64_t;
int main() {
    ll n;
    std::cin >> n;
    ll b = 60;
    while (true) {
        ll mask = 1ll << b;
        if (b & n) break;
        b--;
    }
    std::cout << (1ll << b) << std::endl;
    return 0;
}