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#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

vector<ll> p;

ll maks = 0;


void oblicz(short ind, ll ilo, ll &k, ll &n){
    if(ind == k){
        maks = max(maks, ilo);
        return;
    }

    for(int i = 1; i*ilo <= n; i *= p[ind])
        oblicz(ind + 1, ilo*i, k, n);
}

int main(){
    ios_base::sync_with_stdio(0);
    ll k, n, a;
    cin >> k >> n;

    for(int i = 0; i < k; i++){
        cin >> a;
        p.push_back(a);
    }
    oblicz(0, 1, k, n);
    cout << maks;
}