想要换最多的汽水,就要厚脸皮,每两个空瓶向老板借一瓶汽水,喝完之后拿三个空瓶再换一瓶还给老板;相当于自己每两个空瓶可以换到一瓶汽水
核心代码bottle/2

import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNextInt()){
            int bottle = sc.nextInt();
            if(bottle==0){
                break;
            }
            System.out.println(bottle/2);
        }
    }
}