<html>
<body>
<form action=<?php echo $PHP_SELF; ?> METHOD=POST>
Day : <input type=text name=day maxsize=2><br>
Month : <input type=text name=month maxsize=2><br>
Year : <input type=text name=year maxsize=2><br>
<input type=submit value=submit>

<?

if ($day && $month && $year) {

$calc = ($day[0] * $day[1]) + ($month[0] * $month[1]) + ($year[0] * $year[1]);

echo "Your lucky no. is $calc";

}

?>