using System;
/*
 * Write a program that prints the first 10 members of the sequence: 2, -3, 4, -5, 6, -7, ...
 */
class PrintSequence
{
    static void Main()
    {
        for ( int i = 2 ; i < 12 ; i++ )
        {
            if ( i % 2 == 0 )
            {
                Console.WriteLine(i);
                continue;
            }
            Console.WriteLine(-i);
        }

    }
}