Loop Find Number Return String

    class Program
    {

        static void Main(String[] args)
        {
            string fileName =
            System.Environment.GetEnvironmentVariable("OUTPUT_PATH");
            TextWriter tw = new StreamWriter(@fileName, true);
            string res;
            int _arr_size = 0;
            _arr_size = Convert.ToInt32(Console.ReadLine());
            int[] _arr = new int[_arr_size];
            int _arr_item;
            for (int _arr_i = 0; _arr_i < _arr_size; _arr_i++)
            {
                _arr_item = Convert.ToInt32(Console.ReadLine());
                _arr[_arr_i] = _arr_item;
            }
            int _k;
            _k = Convert.ToInt32(Console.ReadLine());
            res = findNumber(_arr, _k);
            tw.WriteLine(res);
            tw.Flush();
            tw.Close();
        }

        private static string findNumber(int[] arr, int k)
        {
            for (int i = 0; i < arr.Length; i++)
            {
                if (arr[i] == k)
                    return "YES";
            }
            return "NO";
        }
     }
}