Java: 换汽水

[.时倾]

Java:20块钱买汽水，一块钱一瓶，两个空瓶能换一瓶，三个瓶盖能换一瓶，可以赊的，用Java怎写

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public static void main(String[] args) {
        System.out.println(sum(20,0,0));
    }
	
	public static int sum(int bottle,int cap,int emptyBottle){   
        int ping=bottle+emptyBottle;
        int gai=bottle+cap;
        if(ping/2+gai/3==0){
            return bottle;
        }
        return bottle+sum(ping/2+gai/3,gai%3,ping%2);        
    }