class CoffeeCupE {
    static final int volume = 200;
    static float ratio;
    int amount;
    static void setRatio(float f) {
        CoffeeCupE.ratio = f;
    }
    void fill() {                                                 
        this.amount = (int)(CoffeeCupE.ratio * CoffeeCupE.volume);
    }                                                             
    void drink(int i) {  
        this.amount -= i;
    }                    
    int getAmount() {      
        return this.amount;
    }                      
}