class Post:
    def __init__(self, name, likes):
        self.name = name
        self.likes = likes

    def like(self):
        self.likes += 1

    def dislike(self):
        self.likes -= 1
        if self.likes < 0:
            self.likes = 0


reaction = Post("코리", 0)

reaction.like()
reaction.dislike()
reaction.dislike()

print(reaction.likes)