C#: Compute the sum of the numbers in a given array except those numbers starting with 5 followed by at least one 6

using System; // Importing the System namespace

namespace exercises // Defining a namespace called 'exercises'
{
    class Program // Defining a class named 'Program'
    {
        static void Main(string[] args) // The entry point of the program
        {
            // Displaying a message indicating the purpose of the output
            Console.WriteLine("Sum of the numbers of the said array except those numbers starting with 5 followed by at least one 6: ");

            // Outputting the results of the 'test' method with various integer arrays as arguments
            Console.WriteLine(test(new[] { 5, 6, 1, 5, 6, 9, 10, 17, 5, 6 }));
            Console.WriteLine(test(new[] { 5, 6, 1, 5, 6, 9, 10, 17 }));
            Console.WriteLine(test(new[] { 1, 5, 6, 9, 10, 17, 5, 6 }));
            Console.WriteLine(test(new[] { 1, 5, 9, 10, 17, 5, 6 }));
            Console.WriteLine(test(new[] { 1, 5, 9, 10, 17, 5}));
        }

        // Method to calculate the sum of numbers in the array, excluding those starting with 5 followed by at least one 6
        static int test(int[] nums)
        {
            int sum = 0; // Initializing a variable to hold the sum of numbers in the array
            int inSection = 0; // Variable to track if the code is within a specific section
            int flag = 0; // Flag to identify the start of the section

            // Looping through each element of the array
            for (int i = 0; i < nums.Length; i++)
            {
                inSection = 0; // Resetting the section flag at the beginning of each iteration

                // Checking if the current element is 5
                if (nums[i] == 5)
                {
                    inSection = 0; // Resetting the inSection flag
                    flag = 1; // Setting the flag to indicate the start of the section
                }

                // Checking if the current element is 6 and not in the section
                if (inSection == 0 && nums[i] == 6)
                {
                    // Checking if the flag indicates the start of the section
                    if (flag == 1)
                    {
                        sum = sum - 5; // Adjusting the sum by subtracting 5 (to exclude 5 from the sum)
                        inSection = 1; // Marking the section
                    }
                    flag = 0; // Resetting the flag
                }

                // Checking if the code is not in the section, then adding the number to the sum
                if (inSection == 0)
                {
                    sum += nums[i];
                }
            }
            return sum; // Returning the total sum of numbers in the array excluding the specified pattern
        }
    }
}