Exam 7. Biggest Triple

namespace _2.BiggestTriple
{
    using System;

    public class BiggestTriple
    {
        public static void Main(string[] args)
        {
            checked
            {
                string inputLine = Console.ReadLine();

                int[] nums = SplitInputStringAndCreateArrayOfNumbers(inputLine);
                if (nums.Length > 3)
                {
                    int maxSum = int.MinValue;
                    int startIndex = 0;
                    int remainder = nums.Length % 3;
                    int maxIndex = nums.Length - remainder;
                    for (int i = 0; i + 2 < maxIndex; i += 3)
                    {
                        int currentSum = nums[i] + nums[i + 1] + nums[i + 2];
                        if (currentSum > maxSum)
                        {
                            maxSum = currentSum;
                            startIndex = i;
                        }
                    }

                    int currentSum2 = CalculateSumFromRemaindSequence(nums, maxSum, remainder);

                    if (maxSum >= currentSum2)
                    {
                        for (int i = startIndex; i <= startIndex + 2; i++)
                        {
                            Console.Write("{0} ", nums[i]);
                        }
                    }
                }
                else
                {
                    foreach (var num in nums)
                    {
                        Console.Write("{0} ", num);
                    }
                }
            }
        }

        private static int CalculateSumFromRemaindSequence(int[] nums, int maxSum, int remainder)
        {
            checked
            {
                int currentSum = int.MinValue;
                if (remainder > 0)
                {
                    if (remainder == 1)
                    {
                        currentSum = nums[nums.Length - 1];
                        if (currentSum > maxSum)
                        {
                            Console.WriteLine(nums[nums.Length - 1]);
                        }
                    }
                    else if (remainder == 2)
                    {
                        currentSum = nums[nums.Length - 1] + nums[nums.Length - 2];
                        if (currentSum > maxSum)
                        {
                            Console.WriteLine("{0} {1}", nums[nums.Length - 2], nums[nums.Length - 1]);
                        }
                    }
                }

                return currentSum;
            }
        }

        private static int[] SplitInputStringAndCreateArrayOfNumbers(string inputStr)
        {
            checked
            {
                char[] separators = new char[] { ' ', ',', ';' };
                string[] numStr = inputStr.Split(separators, StringSplitOptions.RemoveEmptyEntries);
                int[] arr = new int[numStr.Length];
                for (int i = 0; i < numStr.Length; i++)
                {
                    arr[i] = int.Parse(numStr[i]);
                }

                return arr;
            }
        }
    }
}