class CPU {
    void start() {
        System.out.println("CPU: starting...");
    }
    void shutdown() {
        System.out.println("CPU: shutting down...");
    }
}

class Memory {
    void load() {
        System.out.println("Memory: loading data...");
    }
    void free() {
        System.out.println("Memory: freeing data...");
    }
}

class HardDrive {
    void read() {
        System.out.println("HDD: reading data...");
    }
    void write() {
        System.out.println("HDD: writing data...");
    }
}

class ComputerFacade {
    private CPU cpu;
    private Memory memory;
    private HardDrive hdd;

    ComputerFacade() {
        this.cpu = new CPU();
        this.memory = new Memory();
        this.hdd = new HardDrive();
    }

    void start() {
        System.out.println("=== Starting Computer ===");
        cpu.start();
        memory.load();
        hdd.read();
        System.out.println("=== Computer Ready ===");
    }

    void shutdown() {
        System.out.println("=== Shutting Down ===");
        hdd.write();
        memory.free();
        cpu.shutdown();
        System.out.println("=== Goodbye ===");
    }
}

public static void main(String[] args) {
    ComputerFacade computer = new ComputerFacade();
    computer.start();
    computer.shutdown();
}