What is the output of the following program in a dynamically scoped language called DragonD? Assume big$()$ is called from somewhere else.

function big$()\{$

var $x=22$;

var $y=10$;

var $z=5$

function sub$1($int $x$

var $y=14$;

sub$2()$;

$\}$

function sub$2()\{$

var $y=3$;

function sub$3()\{$

var $z=6$

print $x+y+z$;

$\}$

sub$3()$;

$3$

sub$1(6)$;

$\}$

The correct answer is: $15$