Parse Error on Simple Time Script

[onestopplay]

Here is my simple script:

<?php
$3daystime = time() + (3 * 24 * 60 * 60);
echo $3daystime;
?>

I get this error:

Parse error: syntax error, unexpected T_LNUMBER, expecting T_VARIABLE or '$' in /Users/Sites/test.php on line 2

Anybody know what's wrong?
Thanks!

[bluewalrus]

I dont think variable names can start with a number try three.

[onestopplay]

Wow I feel really stupid. Thanks so much!