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#include<bits/stdc++.h>
#define VAR(i,n) __typeof(n) i = (n)
#define loop(i,j,s) for(int i=j;i<s;i++)
#define loopback(i,j,s) for(int i=j;i>=s;i--)
#define foreach(i,c) for(VAR(i,(c).begin());i!=(c).end();i++)
#define pln( x ) cout << x << "\n"
#define ps( x ) cout << x << " "
#define entr cout << "\n"
#define pcnt(i) __builtin_popcount(i)
#define ll long long
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define SIZE(c) (c).size()
#define ALL(c) (c).begin(), (c).end()
using namespace std;
typedef vector<int> VI;
const int INFTY=20000000;
const int MAX=500100;
const int MOD=10000000;

void coutTab(int* tab,int n){
	loop(i,0,n){
		cout<<tab[i]<<" ";
	}
	cout<<"\n";
}
//------------------------------------------
ll N;
ll ln;
ll maxN=0;
vector<ll> prim;
void gen(int i,ll n){
	if(i==SIZE(prim)) maxN=max(maxN,n); 
	else{
		gen(i+1,n);
		while(n<N){
			ln=n;
			n*=prim[i];
			//pln(n);
			if(n>N||n%ln!=0||ln>n) break;
			gen(i+1,n);
		}
	}
}

int main(){
	ios_base::sync_with_stdio(0);
	int k;
	ll a;
	cin>>k>>N;
	loop(i,0,k){ 
		cin>>a;
		prim.pb(a);
	}
	sort(ALL(prim));
	gen(0,1);
	pln(maxN);	
}