题解 | #汽水瓶#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNextInt()){
            Integer n = sc.nextInt();
            if(n==0){
                break;
            }else if(n>=1&&n<=100){
                int count = 0;
                count = (n-n%2)/2;
                System.out.println(count);
            }
        }
    }
}
/*
* 1->0
* 2->1
* 3->1
* 4->5
* 5->5
* 6->3
* 7->3
* 8->4
* 9->4
* 10->5
* n->(n-n%2)/2
* */