What is the output of this Java program?

class Driver $\{$

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

int $a=f(7)$;

$\}$

int $b=$;

static int foo$($int a$)\{$

$a\frac{?}{b}=ar(a-3)$

System.out.print$($a$)$;

$\}$

return $a$;

static int bar$($int a$)\{$

$a=a-1$

System.out.print$($a$)$;

$\}$

return $a+2$

$\}$