var t,i:integer;
    n:longint;
    f,g:text;

 function uc(n:longint):integer;
  var i:longint;
      j,p:0..4;
      ucs,uca,uci:0..9;
  begin
   ucs:=0;
   for i:=1 to n do
     begin
     p:=i mod 4;
     if p=0 then p:=4;
     uca:=1;
     uci:=i mod 10;
     for j:=1 to p do uca:=(uca*uci) mod 10;
     ucs:=(ucs+uca) mod 10;
     end;
   uc:=ucs;
  end;

begin
  assign(f,'cifra.in');
  assign(g,'cifra.out');
  reset(f);
  rewrite(g);
  readln(f,t);
  for i:=1 to t do
    begin
    readln(f,n);
    writeln(g,uc(n));
    end;
  close(f);
  close(g);
end.