class A {
    public void m(int k) {
        System.out.println("class A, method m : " + ++k);
    }
}

class B extends A {
    public int m(int k) {
        System.out.println("class B, method m : " + k++);
        return k;
    }
}

public class MainClass {
    public static void main(String args[]) {
        A a = new B();
        a.m(34);
    }
}