Lea is a dying girl. She started the final challenge. This is a paper, which aims to prove that happiness can be multiplied, and feelings of sadness, loneliness and pain can also be multiplied. With the development of research, she discovered the "Witt effect" which is a phenomenon that produces negative domino effect. She turned to a project that would have the opposite effect. This project is called "Happiness Effect" Using eclectic, individualistic experimental methods and the power of positive thinking, connections and equations, she embarked on a road to discover the ultimate happiness.