Eighteen

As per Sanathana Dharma 18 is a holy number. It denotes ‘jaya’(victory)
That is why Bhagavat Geetha has 18 chapters, Mahabharata 18 Parvas and Bhagavatham has 18000 Shlokas.
Bhagavatham which has 18000 Shlokas has its complete essence in the Tenth Canto. The essence of 10th Canto is in the 5 chapters of ‘Raasa Panchaadyayi’. The essence of all essences is the Gopika Geetham in Rasa Panchadyayi!
The number of shlokas in gopika geetham?
18!