import java.awt.*;

abstract class Entertainment {

    protected int volume;
    private boolean on;

    public void switchOn() {
        on = true;
    }

    public void switchOff() {
        on = false;
    }

    public abstract void changeVolume(int amount);

    public abstract void display(Graphics g);

}

interface ElectricalDevice {
    public void setTimeInUse(int time);
    public int getTimeInUse();
    public int getPower();
}

class TV extends Entertainment implements ElectricalDevice {

    private int  channel;
    private int time;

    public void changeVolume(int amount) {
            volume = volume + amount;
    }

    public void display (Graphics g) {
        g.fillRect(10, 10, 10, volume);
    }

    public void setTimeInUse(int time) {
        this.time = time;
    }

    public int getTimeInUse() {
        return time;
    }

    public int getPower() {
        return 100;
    }

}

class ElectricityManager {

    private int totalPower;

    public void calcPower(ElectricalDevice device) {
        int power = device.getTimeInUse() * device.getPower();
        totalPower = totalPower + power;
        device.setTimeInUse(0);
    }
}