﻿//Problem 16.* Print Long Sequence
//Write a program that prints the first 1000 members of the sequence: 2, -3, 4, -5, 6, -7, …

using System;
class PrintLongSequence
{
    static void Main()
    {
        for (int i = 2; i < 1001; i++)
        {
            
            if (i%2==1)
            {
                Console.Write(-i);
            }
            else Console.Write(i);
           Console.Write(", ");
        }
    }
}