using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
	public delegate int BinaryOp(IntCalc a);

	public class IntCalc
	{
		public int Result, X;

		public IntCalc(int result, int x)
		{
			Result = result;
			X = x;
		}
	}

	public class MyMath
	{
		public int Addition(IntCalc a)
		{
			a.Result += a.X;
			return a.Result;
		}

		public int Subtraction(IntCalc a)
		{
			a.Result -= a.X;
			return a.Result;
		}
	}
	class Program
	{
		static void Main(string[] args)
		{
			MyMath mm = new MyMath();
			BinaryOp bo = mm.Addition;
			BinaryOp bo1 = mm.Subtraction;
			BinaryOp all = bo;
			all += bo1;

			Console.WriteLine("{0}", all(new IntCalc(14, 40)));
			Console.ReadKey();
		}
	}
}