MC 1.14.4

I'm fairly new into mc modding, like 4 hours. So what i'm saying is probably not giving much sense but anyway, i'm trying to count all living chickens and i thought that it would be really simple but i guess it ain't.

I've got 
 

   @SubscribeEvent
   public void onLivingSpawnEvent(LivingEvent event)
   {

      LivingEntity entity = event.getEntityLiving();
      if(!(entity instanceof ChickenEntity && entity.hasCustomName()))
         return;

         LOGGER.warn(entity);

   }

I saw that each entity has its own id so i thought that i'd just remove the duplicates and get the final count but that wouldn't work and it's probably nowhere near the real solution.
So what's the proper way to count all living chickens per tick?

4 minutes ago, FunkyDonkyPunky said:

MC 1.14.4

1.14 is out of support, you'd be better off going for 1.16 or right for 1.17; once there is a release build of 1.17, I believe 1.15 will be out of support as well.

The solution should be similar on all versions, so i'd welcome any help now.

1.14 is no longer supported on this forum.
Please update to a modern version of Minecraft to receive support.