#include <stdio.h>
#include <string.h>
int v[105],a[100001],frecv[105],prim[105];
void mul(int A[100000], int B)
{
      int i, t = 0;
      for (i = 1; i <= A[0] || t; i++, t /= 10)
              A[i] = (t += A[i] * B) % 10;
      A[0] = i - 1;
}
int main(){
	int x,n,p,i,j;
	long long unsigned o;
	FILE*f=fopen("factoriale.in","r");
	FILE*g=fopen("factoriale.out","w");
	for(i=2;i<=100;i++)
		if(!v[i]){
			prim[++prim[0]]=i;
			for(j=i+i;j<=100;j+=i)
				v[j]=1;
		}
	fscanf(f,"%d%d",&n,&p);
	for(i=1;i<=n;i++){
		fscanf(f,"%d",&x);
		for(j=1;j<=prim[0]&&prim[j]<=x;j++){
			o=prim[j];
			while(x/o){
				frecv[prim[j]]+=x/o;
				o*=prim[j];
			}
		}
	}
	a[0]=1;
	a[1]=1;
	for(i=2;i<=100;i++)
		if(frecv[i] && frecv[i]%p){
			for(j=1;j<=p-(frecv[i]%p);j++)
				mul(a,i);
	}
	for(i=a[0];i>=1;i--)
		fprintf(g,"%d",a[i]);
return 0;
}