Code for the "Jesse and cookies" challenge on hackerrank.com

[hackerrank]_Jesse_and_cookies.cs

/*
Jesse loves cookies and wants the sweetness of some cookies to be greater than value K. 
To do this, two cookies with the least sweetness are repeatedly mixed. This creates a special combined cookie with:
(least sweet cookie) + (2 * (second least sweet cookie))

This occurs until all the cookies have a sweetness >= K.
Given the sweetness of a number of cookies, determine the minimum number of operations required. If it is not possible, return -1.
*/

using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using System.Text.RegularExpressions;
using System.Text;
using System;

class Result
{

    /*
     * Complete the 'cookies' function below.
     *
     * The function is expected to return an INTEGER.
     * The function accepts following parameters:
     *  1. INTEGER k
     *  2. INTEGER_ARRAY A
     */

    public static int cookies(int k, List<int> A)
    {
        if (A.Count == 0) return -1;
        
        int startIndex = 0;
        int iters = 0;
        while (A.Count > 0) {        
            A.Sort();
            
            if (A[startIndex] >= k) return iters;
            if ((A.Count - startIndex) == 1 && A[startIndex] < k) return -1;
            
            int newCookie = (2 * A[startIndex + 1]) + A[startIndex];
        
            startIndex += 2;
            A.Add(newCookie);
            iters++;
        }
        
        return -1;
    }

}

class Solution
{
    public static void Main(string[] args)
    {
        TextWriter textWriter = new StreamWriter(@System.Environment.GetEnvironmentVariable("OUTPUT_PATH"), true);

        string[] firstMultipleInput = Console.ReadLine().TrimEnd().Split(' ');

        int n = Convert.ToInt32(firstMultipleInput[0]);

        int k = Convert.ToInt32(firstMultipleInput[1]);

        List<int> A = Console.ReadLine().TrimEnd().Split(' ').ToList().Select(ATemp => Convert.ToInt32(ATemp)).ToList();

        int result = Result.cookies(k, A);
        
        textWriter.WriteLine(result);

        textWriter.Flush();
        textWriter.Close();
    }
}