class Horse implements Animal, Asset {
    int stomachCapacity;
    int stomachContents;
    double marketValue;
    public String makeNoise() {
        return "Neigh";
    }
    public String move(int numSteps) {
        return "Gallop";
    }
    public void eat(int pounds) throws Exception {
        this.stomachContents += pounds;
        if (this.stomachContents > this.stomachCapacity) {
            throw new Exception();
        }
    }
    public void depreciate(double fracDepr) {
        this.marketValue *= (1 - fracDepr);
    }
}