doubt in annotate

[vitans...@collegedekho.com]

input - Review.objects.values('description','user','review_type','reviewmapping__insitute').annotate(Count('description','user')).annotate(Count('review_type','reviewmapping__insitute')).count()

output - 2720

this query does not give id of 2720 objects for filter objects

for ids I use 

input - Review.objects.values('description','user','review_type','reviewmapping__insitute').annotate(Count('description','user')).annotate(Count('review_type','reviewmapping__insitute')).values_list('id',flat=True).count()

Output - 5139

it returns total objects ids

my question is how i get id of 2720 objects