题解 | 买橘子

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 in = new Scanner(System.in);
        int a = in.nextInt();
        int b = 8;
        int c = 6;
        int count;
        if (a % 2 != 0 || a < 6 ||a==10 ) {
            System.out.println("-1");
            return;
        }
        int e;
        count = a / 8;
        e = a % 8;
        if (e == 0) {
            System.out.println(count);
            return;
        } if (e == 2 || e == 4 || e == 6) {
            System.out.println(count + 1);
            return;
        }
        }
    }