Can you plese advise
package pl.codegym.task.task04.task0412;
/*
Liczby dodatnie i ujemne
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int a = reader.read();
if (a > 0)
{System.out.print(a*2);}
else if (a < 0)
{System.out.print(a+1);}
else if (a == 0)
{System.out.print(0);}
}
}