#include<fstream.h>
#include<math.h>
long fact(int n)
{
long i,m=1;
for(i=2;i<=n;i++)
   m=m*i;
return m;

}
int main()
{
ifstream f("factoriale.in");
ofstream g("factoriale.out");
int i,n,k,x; long fac=1;
f>>n;f>>k;
for (i=1;i<=n;i++) {f>>x;
fac=fac*fact(x);
		   }
int t=1,y=1,v;
while (t){
  t=0;
  v=fac*y;
  if( sqrt(v)==long(sqrt(v)) ) {g<<y;} else t=1;
  y++;}


return 0;
}