using System;
using System.Globalization;
using System.Linq;
using System.Collections.Generic;

public class Test
{
    

	public static void Main()
	{
        for (int i = 2; i <= 100; i++)
		{
		    int val = i % 2 == 1 ? i * -1 : i;
		    Console.WriteLine(val);
		}
	}
}