class Squirrel(object):
    def __init__(self, hunger, energy):
        self.hunger = hunger
        self.energy = energy
        self.nuts_eaten = 0

    def eat_nuts(self):
        self.hunger -= 5
        self.energy += 3
        self.nuts_eaten += 5
        return self.nuts_eaten


class PolarBear(object):
    def __init__(self, hunger, energy):
        self.hunger = hunger
        self.energy = energy
        self.fish_eaten = 0

    def eat_fish(self):
        self.hunger -= 10
        self.energy += 5
        self.fish_eaten += 10
        return self.fish_eaten

class Snake(object):
    def __init__(self, hunger, energy):
        self.hunger = hunger
        self.energy = energy
        self.frogs_eaten = 0

    def eat_fish(self):
        self.hunger -= 3
        self.energy += 1
        self.frogs_eaten += 2
        return self.frogs_eaten

class ZooKeeper(object):
    def __init__(self, name, employeeId, food_budget):
        self.name = name
        self.employeeId = employeeId
        self.food_budget = food_budget

    def feed(self, animal):
        if isinstance(animal, Squirrel):
            nuts_consumed = animal.eat_nuts()
            self.food_budget -= (nuts_consumed * 1)
        elif isinstance(animal, PolarBear):
            fish_consumed = animal.eat_fish()
            self.food_budget -= (fish_consumed * 10)
        elif isinstance(animal, Snake):
            frogs_consumed = animal.eat_frogs()
            self.food_budget -= (frogs_consumed * 5)