What is the output displayed by the following code?

function calculate$()\{$

$num $=$ func$\_$num$\_$args$()$;

$result $=0$;

for$($$i $=0$; $i $<$ $num; $i$++)\{$

$result $+=$ func$\_$get$\_$arg$($$i$)$;

$\}$

return $result $*$ $num;

$\}$

echo calculate$(3,2,1,0)$;