var fact,i,p,s,n,k,j:longint;
    f,g:text;
begin
assign(f,'cifra.in');
assign(g,'cifra.out');
reset(f);
rewrite(g);
readln(f,k);
for p:=1 to k do
BEGIN
readln(f,n);
s:=0;
i:=1;
while i<=n do
  begin
  fact:=i;
   for j:=1 to i-1 do
   fact:=fact*i;
   s:=s+fact;
   i:=i+1;
  end;
if s<>0 then
writeln(g,(s mod 10));
END;
close(f);close(g);
end.