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#include <iostream>
#include <fstream>
using namespace std;
long long v[1000005];
int main()
{
ifstream cin("factoriale.in");
ofstream cout("factoriale.out");
long long n,k,fact=1,prod=1,inm=1,ok=0;
cin>>n>>k;
for(int i=0;i<n;i++)
{
cin>>v[i];
for(long long j=1;j<=v[i];j++)
fact*=j;
prod*=fact;
fact=1;
}
for(long long i=1;i<=prod;i++)
{
for(long long j=1;j<=k;j++)
inm*=i;
for(long long j=1;j<=prod;j++)
{
if(prod*j>inm)
break;
if(prod*j==inm)
{
cout<<j;
ok=1;
}
if(ok==1)
break;
}
if(ok==1)
break;
inm=1;
}
return 0;
}