#include <iostream>
#include <iomanip>
#include <cmath>
#include <functional>
#include <algorithm>
#include <numeric>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <deque>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <boost/range/irange.hpp>
#include <boost/container/static_vector.hpp>
#include <boost/utility/string_ref.hpp>
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/math/common_factor_rt.hpp>

class input
{
public:
    input()
    {
        std::cin.tie(nullptr);
        std::ios::sync_with_stdio(false);
    }

    template <class T>
    inline input& operator>>(T& var) { return std::cin >> var, *this; }
    template <class T>
    inline input& operator,(T& var) { return *this >> var; }

    template <class T>
    inline T read()
    {
        T var;
        std::cin >> var;
        return var;
    }

    template <class InputIterator>
    inline void read(InputIterator head, std::size_t n)
    {
        for (std::size_t i = 0; i < n; ++i) {
            std::cin >> *head;
            ++head;
        }
    }

    template <class T>
    inline std::vector<T> read(std::size_t n)
    {
        std::vector<T> res;
        res.reserve(n);

        for (std::size_t i = 0; i < n; ++i) {
            T tmp;
            std::cin >> tmp;
            res.emplace_back(tmp);
        }
        return res;
    }

    template <class T, class F>
    inline void online(std::size_t n, F&& f)
    {
        T var;
        for (std::size_t i = 0; i < n; ++i) {
            std::cin >> var;
            f(var);
        }
    }
};
template <class T, std::size_t n>
std::istream& operator>>(std::istream& in, std::array<T, n>& var)
{
    for (std::size_t i = 0; i < n; ++i) {
        in >> var[i];
    }
    return in;
}

class output
{
    std::ostream& cout;

    template <class T, class... Args>
    void impl(T&& v, Args&&... args)
    {
        cout << std::forward<T>(v) << ' ';
        impl(std::forward<Args>(args)...);
    }
    template <class T>
    void impl(T&& v)
    {
        cout << std::forward<T>(v);
    }

public:
    output() : cout(std::cout)
    {
        cout << std::fixed << std::setprecision(15);
    }

    template <class... Args>
    void operator()(Args&&... args)
    {
        impl(std::forward<Args>(args)...);
        cout << '\n';
    }
    template <class... Args>
    void noreturn(Args&&... args)
    {
        impl(std::forward<Args>(args)...);
    }

    template <class T>
    void print(const T& container)
    {
        bool first = true;
        for (auto&& x : container) {
            if (!first) {
                cout << ' ';
            }
            cout << x;
            first = false;
        }
        cout << '\n';
    }
};

void prog()
{
    input in;
    output out;
    auto n = in.read<std::size_t>();
    auto a = in.read<std::uint64_t>(n);

    std::vector<std::uint64_t> gcd(n), rgcd(n);
    gcd.front() = a.front();
    rgcd.back() = a.back();
    for (auto i : boost::irange(1ul, n)) {
        gcd[i] = boost::math::gcd(gcd[i - 1], a[i]);
        rgcd[n - i - 1] = boost::math::gcd(rgcd[n - i], a[n - i - 1]);
    }
    std::uint64_t res = 0;
    for (auto i : boost::irange(0ul, n)) {
        std::uint64_t l = 0, r = 0;
        if (i != 0) l = gcd[i - 1];
        if (i != n - 1) r = rgcd[i + 1];
        res = std::max(res, boost::math::gcd(l, r));
    }
    out(res);
}

int main()
{
    prog();
    return 0;
}


Measured memory_bytes: 2560