var i,s,j,t,n,u,p:longint;
function pt(x:integer):integer;
 begin
  p:=1;
   for j:=1 to n do
    begin
     p:=p*i;
    end;
   pt:=p
 end;
begin
 assign(input,'cifra.in');reset(input);
 assign(output,'cifra.out');rewrite(output);
 readln(t);
  while not eof(input) do
   begin
    readln(n);
     for i:=1 to n do
      begin
       s:=s+pt(i) mod 10;
      end;
    writeln(s mod 10);
    s:=0;
   end;
 close(input);
 close(output);
end.