题解 | #汽水瓶#

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