\begin{scope}[node distance=0.75cm]

\node (DoDo4) [inner xsep=0.01cm, inner ysep=0.03cm] at (0, 0) {@};

\node (TimesAp)
  [xshift=0.25cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=DoDo4, left of=DoDo4]
  {@};

\node (Times)
  [xshift=0.25cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=TimesAp, left of=TimesAp]
  {$+$};

\node (8) 
  [xshift=-0.5cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=DoDo4, right of=DoDo4, yshift=-0.75cm]
  {8};

\draw[->] (DoDo4)   to (TimesAp);
\draw[->] (TimesAp) to (Times);
\draw[->] (TimesAp) |- (8);
\draw[->] (DoDo4)   to (8);

\end{scope}