It says: find the quantity

Я сделал всё на английском, а как сделать случайные тесты не знаю. Я первый раз создаю кату.

Please review kata authoring guideline on the basic requirements of a kata:

• Kata should be written in English
• There are no sample tests
• There should be random tests
• Your initial code passes the actual tests
• The kata idea is not novel enough for a new kata, similar katas like this got retired very quickly