import java.io.*; public class Solution { public static void main(String[] args) throws Exception { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); int n = Integer.parseInt(reader.readLine()); if(n == 0) { System.out.println("zero");} else if(n < 0) { n++; System.out.println(n); } else { System.out.println(n * 2); } } } If the entered number is zero, display zero. WHY?