static void Main()
        {
            Action<string> writeLn = Console.WriteLine;
            Func<int> readNumber = () =>
            {
                int number;
                while (!int.TryParse(Console.ReadLine(), out number))
                    writeLn("Invalid format, try again");

                return number;
            };

            writeLn("Enter collection length");
            int collectionLength;

            while (true)
            {
                collectionLength = readNumber();
                const int MAX_LENGTH = 5;
                if (collectionLength > 0 && collectionLength <= MAX_LENGTH)
                    break;

                writeLn(string.Format("Number should be between 0 and {0}. Please try again", MAX_LENGTH));
            }

            var xValues = new List<int>(collectionLength);
            foreach (var i in Enumerable.Range(0, collectionLength))
            {
                writeLn(string.Format("Enter '{0}' element of initial collection", i + 1));
                xValues.Add(readNumber());
            }

            writeLn("Resulting collection:" + Environment.NewLine);
            foreach (var xValue in xValues)
            {
                string yValue;
                try
                {
                    checked
                    {
                        yValue = ((xValue * xValue - 2) / (xValue + xValue)).ToString();
                    }
                }
                catch (OverflowException)
                {
                    yValue = "OVERFLOW";
                }
                catch (DivideByZeroException)
                {
                    yValue = "DIVIDE BY ZERO";
                }
                writeLn(yValue);
            }
        }