How do I fix this
package com.codegym.task.task04.task0412;
/*
Positive and negative numbers
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String s = reader.readLine();
int num = Integer.parseInt(s);
if (num<0) {
num*=2;
System.out.println(num);
}
else
if (num>0) {
num++;
System.out.println(num);
}
else {
num=0;
System.out.println(num);
}
}
}