class MyPartyD {
    public static void main(String[] arg) {
        CoffeeCupD.setRatio(1 - 0.2F);
        CoffeeCupD c1 = new CoffeeCupD(), c2 = new CoffeeCupD();
        c1.amount = c2.amount
                  = (int)(CoffeeCupD.ratio * CoffeeCupD.volume);
        c1.amount -= 20;
        System.out.println(c1.amount);
        System.out.println(c2.amount);
    }
}