UVA - 10519 - !! Really Strange !!

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;

public class Main {

    public static void main(String[] args) throws IOException {

        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        StringBuffer sb = new StringBuffer("");
        String m="";
        while((m=br.readLine())!=null){
            BigInteger p=new BigInteger(m);
            p=p.abs();
            if(p.compareTo(BigInteger.ZERO)==0)
                sb.append("1\n");
            else if(p.compareTo(BigInteger.ONE)==0)
                sb.append("2\n");
            else
                sb.append((p.multiply(p)).subtract(p.subtract(BigInteger.valueOf(2)))).append("\n");
        }
        System.out.print(sb);
    }
}