import java.io.*; public class Solution { public static void main(String[] args) throws Exception { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String num = reader.readLine(); int b = Integer.parseInt(num); sravnenie (b); System.out.println(b); } public static int sravnenie (int a) { if (a>0) { return (a*2); } else if (a<0) { return (a+1); } else if (a==0) { return a; } return 0; } }