class Computer {
    int cpu;
    void Crash(int numTimes) {
        int i;
        for (i = 0; i < numTimes; i = i + 1) 
            Print("sad\n");
    }
}

class Mac extends Computer {
    int mouse;
    void Crash(int numTimes) {
        Print("ack!");
    }
}

class Main {
    static void main() {
        class Mac powerbook;
        powerbook = new Mac();
        powerbook.Crash(2);
    }
}