1.
/*
 * ACM Contest training
 * Problem: 913 Joana and the Odd Numbers
 * Link: http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=11&page=show_problem&problem=854
 *
 * @author Christoph Göttschkes
 * @version 1.0, 10/20/2010
 *
 * Method : Ad-Hoc
 * Status : Accepted
 * Runtime: 0.084
 */

import java.io.*;

class Main
{
    public static void main(String[] args) throws Exception
    {
	BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

	long number = Long.parseLong(reader.readLine());

	while (reader.ready()) {

	    System.out.println(calc(number));

	    number = Long.parseLong(reader.readLine());
	}
	System.out.println(calc(number));
    }

    public static long calc(long line) {
	line = (line + 1) >> 1;
	return (((line*line) << 1) - 1) * 3 - 6;
    }
}


2. 
/** * FWP, Ausgewählte Probleme aus dem ACM Programming Contest, SS10  
 * * Problem: 913 - Joana and the Odd Numbers
 * * Link: http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=11&page=show_problem&problem=854
 * * Savkina Ekaterina
 * * @version 1.0, 29/04/2010 
 * * Status : Accepted 
 * * Runtime:  	0.128 */
package odd;

import java.math.BigInteger;
import java.util.Scanner;

public class Odd {
	public static void main(String... args) {
		Scanner sc = new Scanner(System.in);
		BigInteger sum = new BigInteger("0");
		while (sc.hasNext()) {
			int count = sc.nextInt();
			if (count == 0)
				System.out.println(1);
			else {
				count = count / 2 + 1;
				BigInteger co = BigInteger.valueOf(count);
				sum = co.add(BigInteger.ONE).multiply(co).subtract(co)
						.multiply(BigInteger.valueOf(2)).subtract(
								BigInteger.ONE).multiply(BigInteger.valueOf(3))
						.subtract(BigInteger.valueOf(6));
				System.out.println(sum);
			}
		}
	}
}