#include <fstream>
using namespace std;
ifstream fin("factoriale.in");
ofstream fout("factoriale.out");
int n,k,i,j,m,prod,t,v[101],p[101],e[101],x[100001];
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[0]=x[1]=1;
    for (i=1;i<=m;i++) {
        if (e[i]==0)
            break;
        while (e[i]%k!=0) {
            t=0;
            for (j=1;j<=x[0];j++) {
                x[j]=x[j]*p[i]+t;
                t=x[j]/10;
                x[j]%=10;
            }
            while (t!=0)  {
                x[++x[0]]=t%10;
                t/=10;
            }
            e[i]++;
        }
    }
    for (i=x[0];i>=1;i--)
        fout<<x[i];
    return 0;
}