java| #汽水瓶#

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);

        while(sc.hasNext()){
            int input=sc.nextInt();
            if(input==0){
                break;
            }
            System.out.println(input/2);

        }
    }
}