using System;

using System.Threading.Tasks;

​

public class Program

{

    public static int total=0;

    public static void Main()

    {

        Task tarea = new Task(() => numeros());

        tarea.Start();

        Task tarea2 = new Task(() => numeros());

        tarea2.Start();

        Task tarea3 = new Task(() => numeros());

        tarea3.Start();

        Task tarea4 = new Task(() => numeros());

        tarea4.Start();

        Task tarea5 = new Task(() => numeros());

        tarea5.Start();

    }

    public static void numeros()

    {

        int suma=0, numero, i=1;

        Random rnd = new Random();

        while(i<=20)

        {

            numero=rnd.Next(1,100);

            if(numero%3==0)

            {

                Console.WriteLine(""+numero);

                suma=suma+numero;

                i++;

            }

        }

        i=1;

        while(i<=20)

        {

            numero=rnd.Next(1,100);

            if(numero%3==0)

            {

                Console.WriteLine(""+numero);

                suma=suma-numero;

                i++;

            }

        }

        total=total+suma;

        Console.WriteLine("Total: "+total);

    }

}