#include <iostream>
#include <vector>

using namespace std;

int main()
{
    vector <long long int> potegi;
    long long int k;
    long long int n;
    cin >> k;
    cin >> n;

    for(int i = 0; i < k; i++)
    {
        int l;
        cin >> l;
        potegi.push_back(l);
    }
    for(long long int j = n; j > 0; j--)
    {
        long long int temp = j;
        for(long long int i = 0; i < potegi.size(); i++)
        {
            while(temp % potegi[i] == 0)
            {
                temp = temp / potegi[i];
            }
        }
        if(temp == 1)
        {
            cout << j << endl;
            return 0;
        }
    }
    cout << "1" << endl;
    return 0;
}