program cifre;
var i,j,t,p,s,n:longint;
    f,g:text;
begin
      assign(f,'cifra.in');
     assign(g,'cifra.out');
     reset(f);
     rewrite(g);
     read(f,t);
     s:=0;
     for j:=1 to t do
     begin
          readln(f,n);
          s:=0;
          p:=0;
          for i:=1 to n do
          begin
            case (i mod 4) of
             0: p:=(i mod 10)*(i mod 10)*(i mod 10)*(i mod 10);
             1: p:=(i mod 10);
             2: p:=(i mod 10)*(i mod 10);
             3: p:=(i mod 10)*(i mod 10)*(i mod 10);
            end;
            s:=(s+p) mod 10;
          end;
          writeln(g,s);
     end;
     close(f);
     close(g);
end.