3.4.2

  class program
    {
        static void Main(string[] args)
        {
            int[] numbers = { 1, 2, 3, 4, 5 };


            Console.WriteLine(Sum(numbers));

        }


        static int Sum(int[] numbers)

        {
            int sum = 0;
            for (int i = 0; i < numbers.Length; i++)
            {
                sum = sum + numbers[i];

            }
            return sum;




        }







    }