Retention policies doubt

Hi 

I have a doubt, i have MARS installed and i configured a retention policy of 7 days, ¿ what will happen the day 8 with the FULL BACKUP taken the first day and that it is supposed to be deleted because of the configuration of the retention policy?

I want to explain myself better, i know that the first backup is a FULL backup of all the information and the others are INCREMENTAL backups. If i define a retention policy of 7 days, what will happen the DAY 8 with the FULL BACKUP, when it is supposed that the oldest backup (in this case the FULL Backup) will be deleted.

¿ I will lose the BACKUP FULL taken the first day ?. If the answer is yes ¿ What will happen with all the others incremental backup wich depends on it ?

Thanks in advance