I run out the right answer, but the system shows me error, i really have no clue about that...

package zh.codegym.task.task02.task0205; /* 加薪 */ public class Solution { public static void main(String[] args) { hackSalary(7000); } public static void hackSalary(int a) { //在此编写你的代码 int b= a+1000; System.out.println("你的薪水为:每月 "+b+" 美元。"); } }