Original apps after format Mac

Today I format my Mac and reinstall OS X 10.9, when the OS turn on I saw that the package iWork and iLife are not installed (I think, it´s weird when I bought the Mac it come preinstalled) so I go to the App Store, log with my Apple ID and surprise, I can´t download the apps. They are not in my pursache apps and the App Store want me to buy the apps. So the question is: How can I download the apps again? Obviosly without paying because I have that apps when I bought the Mac.