var n,k,max,i,j,a,d,r,x,p:longint;
    v:array[1..10000] of longint;
    f,g:text;
begin
assign(f,'factoriale.in');reset(f);
assign(g,'factoriale.out');rewrite(g);
read(f,n,k);
max:=0;
for i:=1 to n do begin
                 read(f,x);
                 for j:=2 to x do begin
                                  d:=3;
                                  a:=j;
                                  while a mod 2=0 do begin
                                                     inc(v[2]);
                                                     a:=a div 2;
                                                     end;
                                  repeat
                                       while a mod d=0 do begin
                                                          inc(v[d]);
                                                          a:=a div d;
                                                          end;
                                       d:=d+2;
                                  until a=1;
                                  end;
                 if max<x then max:=x;
                 end;
p:=1;
for i:=2 to max do begin
                   r:=v[i] mod k;
                   if r<>0 then for j:=1 to (k-r) do p:=p*i;
                   end;
writeln(g,p);
close(f);
close(g);
end.