using System;

public class Program

{

    public static void Main()

    {

        int number = 1; //N

        while (number <= 20)

        {

        if (number % 2 == 0)

        {Console.Write(number + " ");}

            number++; //A

        }

        int number1 = 1, suma = 0; //N

        while (number1 <= 20)

        {

            if (number1 % 2 == 1)

            {suma = suma + number1;}

            number1++;

        }

        Console.WriteLine("1+3+5+7+9+11+13+15+17+19 = {0}", suma);

        double tons = 130, year = 2010;

        while (tons >= 10)

        {

            tons = tons / 10;

            {Console.WriteLine (year+2 + " = " + tons + " tons");}

        }

    }

}

​