C42 Academic calculus 1

The girls tried not to scream, but there was no need to mention the pain in their hearts.

Long Xian`er couldn't hold it in anymore and cried out, "Hey, twenty-one women, one person, two people, twenty-one people, that's twenty-one, that's forty-two. I'll give you an explanation, so stop playing!"

The ginseng child said in annoyance, "You're hateful. He knows how to calculate