class Employee:
    def __init__(self, name, base):
        self.name = name
        self.base = base

    def salary(self):
        return self.base


class Teacher(Employee):
    def __init__(self, name, base, hours):
        super().__init__(name, base)
        self.hours = hours

    def salary(self):
        return self.base + self.hours * 500


class Admin(Employee):
    def salary(self):
        return self.base * 1.2


class Cleaner(Employee):
    def salary(self):
        return self.base * 0.8