abstract class Person {
    String name;

    public Person(String name) {
        this.name = name;
    }

    int foo () {
        return 0;
    }
}

class Employee extends Person {

    public Employee(String name) {
        super(name);
    }

    @Override
    int foo() {
        return 1;
    }
}

class Client extends Person {

    public Client(String name) {
        super(name);
    }

    @Override
    int foo() {
        return 2;
    }
}

public class Main {

    public static void main(String[] args) {
        Person Tomek = new Employee("Tomek");
        Person Adam = new Client("Adam");

        System.out.println(Adam.foo());
    }
}