//©Kamil Zarzycki 2017
#include <iostream>
#include <math.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    long long k,N,temp, W = 0;

    cin >> k >> N;

    short tab[k];

    for(long long i = 0; i < k; i++)cin>>tab[i];

    for(long long i = N/2; i <= N; i++)
    {
        temp = i;

        for(long long j = 0; j < k; j++)
        {
            if(temp == 1)
            {
                W = i;
                break;
            }
            if(temp%tab[j] == 0)
            {
                temp/=tab[j];
                j = -1;
            }
        }
    }
    cout << W;
    return 0;
}