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#include <iostream>
#include <cstddef>
#include <vector>
using namespace std;

bool ok(uint16_t i, const vector<uint32_t> &p)
{
    bool end = false;
    while (i > 1 && !end)
    {
        // cerr << "i=" << i << endl;
        end = true;
        for (auto pi : p)
        {
            // cerr << "pi=" << pi << endl;
            if (i % pi == 0)
            {
                // cerr << "div" << endl;
                end = false;
                i /= pi;
            }
            // else cerr << "nodiv" << endl;
        }
    }
    return i <= 1;
}

int main()
{
    ios_base::sync_with_stdio(0);

    uint64_t k, N;

    cin >> k >> N;
    vector<uint32_t> v(k);

    for (uint32_t i = 0; i < k; ++i)
        cin >> v[i];

    for (uint64_t i = N; i >= 0; --i)
    {
        // cerr << "i=" << i << endl;
        if (ok(i, v))
        {
            cout << i << endl;
            break;
        }
    }

    return 0;
}