package zh.codegym.task.task04.task0412; /* 正数和负数 */ import java.io.*; public class Solution { public static void main(String[] args) throws Exception { //在此编写你的代码 BufferedReader b = new BufferedReader(new InputStreamReader(System.in)); int n = Integer.parseInt(b.readLine()); if (n==0) { System.out.println(0); }else if (n>0) { System.out.println(n*2); }else { System.out.println(n+1); } } }