Sequence_OddEven-+

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class LongSequence_3 {
    public static void main(String[] args) {

        //Print the numbers from zero to 1000
        for (int i = 2; i <= 1000; ++i) {
            if (i%2==0)
            {
                System.out.println(i);
            }
            else
            {
                System.out.println(i * -1);
            }


            System.out.println();
        }

    }
}