Consider the countDown method below. How many times is countDown$()$ called if main$()$ calls countDown$(0)?$

public class CountDownTimer $\{$

public static void countDown$($int countInt$)\{$

if $($countInt $<=0)\{$

System.out.println$("$GO$!")$;

$\}$

else $\{$

System.out.println$($countInt$)$;

countDown$($countInt$-1)$;

$\}$

$\}$

public static void main $($String$[]$ args$)\{$

countDown$(0)$;

$\}$

$\}$