#include <stdio.h>
#include <math.h>
#define N 120
int puteri[N],A[N];
int n,k;
void mul(int A[], 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;
}
void descompune(int x)
{
	int i,j,y;
	for(j=2;j<=x;++j)	
	{
		y=j;
		for(i=2;i<=j;++i)
		{
			if(y%i==0)
				while(y%i==0)
				{
					y/=i;
					++puteri[i];
				}
			if(y<=1) break;
		}
	}	
	
}	
int main()
{
	int x,i,y;
	A[0]=1; A[1]=1;
	freopen("factoriale.in", "r",stdin);
	freopen("factoriale.out", "w",stdout);
	scanf("%d%d\n", &n,&k);
	for(i=1;i<=n;++i)
	{
		scanf("%d", &x);
		descompune(x);
	}	
		
	for(i=1;i<=100;++i)
	{
		if(puteri[i]>0)
		if(puteri[i]%k!=0)
			{
				y=k-(puteri[i]%k);
				//printf(" %d ", y);
				y=pow(i,y);
				mul(A,y);
			}	
	}	
	for(i=A[0];i>=1;--i)
		printf("%d", A[i]);
	printf("\n");
	return 0;
}