using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 namespace ConsoleApplication1

 {

     class Program

     {

         static void Main(string[] args)

         {

             Func<string, double, double> funDelegate = CustomCount;

             string[] strArry = new string[] { "73.86", "66.25", "95.57", "33.54", "55.05"};

             double numSum = ;

             numSum = strArry.Sum(s => funDelegate(s, numSum));

             Console.WriteLine(numSum);

             Console.ReadKey();

         }

         public static double CustomCount(string strNum,double Sum)

         {

             Sum += Convert.ToDouble(strNum);

             return Sum;

         }

     }

 }