package com.codegym.task.task04.task0412;
/*
Positive and negative numbers
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
//write your code here
InputStream input = System.in;
InputStreamReader reader= new InputStreamReader(input);
BufferedReader br=new BufferedReader(reader);
// System.out.println("please enter a num");
String num = br.readLine();
int number= Integer.parseInt(num);
if(number>0)
{ number=number*2;
System.out.println(number);}
if (number<0){
// number=number*(-1);
number= (number/-1) + 1;
System.out.println(number);}
if (number==0)
System.out.println(number);
}
}