Reinstall apps on new mac

Being new to apple, having purchased my iMac the other day, I foolishly did not uptick the box for having the login via the cloud, then compounded it

by allowing the system to autofilll the passwords, I could not find them again and after many hours going mad formatted the hard drive and reinstalled Yosemite.

Obviously the apps (iPhoto,iMovie,Garage Band, Pages,Numbers and Keynote have gone is there anyway I can download these from Apple fox or do I have to pay for them after paying a small fortune for the system