using System;

public class Program

{

    public static void Main()

    {

            int Task1(int n) {

                if (n != 0)

                {

                    if (n > 0)

                    {

                        return n * n;

                    }

                    else

                    {

                        return n*(-1);

                    }

                }

                else

                {

                    return n;

                }

            }

            Console.WriteLine($"Hello World { Task1(5) }");

            int Task2(int n)

                {

                    return n;

                }

            Console.WriteLine($"Hello World {Task1(5)}");

            Console.WriteLine($"Task1: {Task1(2)} and test is 4"); //4

            Console.WriteLine($"Task1: {Task1(0)} and test is 0"); //0

            Console.WriteLine($"Task1: {Task1(-11)} and test is 11"); //11

            Console.WriteLine($"Task2: {Task2(401)}"); //410

            Console.WriteLine($"Task2: {Task2(999)}"); //999

            Console.WriteLine($"Task2: {Task2(370)}"); //730

            Console.WriteLine($"Task2: {Task2(625)}"); //652

    }

}