Question

<?php
if(isset($_GET['a']) && isset($_GET['b']) && isset($_GET['c']))
{
$a = $_GET['a'];
$b = $_GET['b'];
$c = $_GET['c'];
$a = intval($a);
$b = intval($b);
$c = intval($c);
$f = 0;
if($a%2 == 0 or $b%2 == 0 or $c%2 == 0)
$f +=$a;
$f +=$b;
$f +=$c;
print "a = ". $a.".
n";
print "b = ". $b.".
n";
print "c = ". $c.".
n";
print "Количество нечетных чисел = ". $f.".";

}
?>