#include<stdio.h>
#define N 102
#define Nmax 102
#define X 50
#define CIF 100
int c[N+2];
int n,k=0,v[X],prez[X],tr[X];


void genereaza_v(){
	int i,j;
	c[0]=c[1]=1;
	for (i=4;i<=N;i+=2)
		c[i]=1;
	for (i=3;i<=N;i+=2)
		if (c[i]==0)
			for(j=i+i;j<=N;j+=i)
				c[j]=1;
	for (i=1;i<=N;++i)
		if (c[i]==0){
			++k;
			v[k]=i;
		}
	k=25;
}

int main(){
	int x[Nmax],i,t,j,xx,r;
	unsigned long long s=1;
	freopen("factoriale.in","r",stdin);
	freopen("factoriale.out","w",stdout);
	scanf("%d%d",&n,&t);
	for (i=1;i<=n;++i)
		scanf("%d",&x[i]);
	genereaza_v();
	for (j=1;j<=n;++j){
		r=x[j];
		for (i=1;i<=k;++i){
			xx=v[i];
			while (r/xx>0){
				prez[i]+=r/xx;
				xx*=xx;
			}
		}
	}
	for (i=1;i<=k;++i)
		if (prez[i]%t!=0)
			tr[i]=t-prez[i]%t;
	for (i=1;i<=k;++i)
		if (tr[i]!=0)
			s*=v[i];
	printf("%llu",s);
	return 0;
}