Problem $3(1$ pt$).$ For the following program, how many process are created by the program, including the initial process?

#include

#include

int main$()$

$\{$

$/*$ fork a child process $*/$

fork$()$;

$/*$ fork another child process $*/$

fork$()$;

$/*$ and fork another $*/$

fork$()$;

return $0$;

$\}$