ha

public int getTvAdsCost()
	{
		int sum=0;
		for(int i=0;i<ads.length;i++)
			if(ads[i] instanceof AdvertisementTV) sum+=ads[i].getCost();
		return sum;
	}

	public int getInternetAdsCost()
	{
		int sum=0;
		for(int i=0;i<ads.length;i++)
			if(ads[i] instanceof AdvertisementInternet) sum+=ads[i].getCost();
		return sum;
	}ha