#include <fstream>
using namespace std;
ifstream fin("factoriale.in");
ofstream fout("factoriale.out");
int n,k,i,j,m,prod,v[101],p[101],e[101];
unsigned long long x;
bool f[101];
int main() {
    fin>>n>>k;
    for (i=1;i<=n;i++)
        fin>>v[i];
    for (i=2;i<=100;i++)
        if (f[i]==0) {
            p[++m]=i;
            for (j=2*i;j<=100;j+=i)
                f[j]=1;
        }
    for (i=1;i<=n;i++)
        for (j=1;j<=m;j++) {
            prod=p[j];
            while (prod<=v[i]) {
                e[j]+=v[i]/prod;
                prod*=p[j];
            }
        }
    x=1;
    for (i=1;i<=m;i++) {
        if (e[i]==0)
            break;
        while (e[i]%k!=0) {
            x*=p[i];
            e[i]++;
        }
    }
    fout<<x;
    return 0;
}