Numerous Katerins. Green D.

Colin is sure that he is able to find happiness only with a girl named Katerina. But...

Katerina IV preferred another guy to him.

Katerina X suggested being friends.

Katerina XVIII threw him by e -mail.

And Katerina XIX just broke his heart.

to survive the next parting, Colin decides to go on a short trip with his best friend. And at the same time develop a formula that can determine the future of any relationship.

Perhaps he will even have a chance to test it in practice and answer the main question: does love obey mathematics?