using System;

​

public delegate int CalculatorDelegate( int n1, int n2);

public class Program

{

    public static void Main()

    {

​

        CalculatorDelegate addDel = new CalculatorDelegate(Addition);

        CalculatorDelegate subDel = new CalculatorDelegate(Subtraction);

        CalculatorDelegate mulDel = new CalculatorDelegate(Multiplication);

        CalculatorDelegate resultDel=addDel-subDel+mulDel;

        Console.WriteLine(resultDel(12,10));

    }

    static int Addition( int num1, int num2){

        return num1+num2;

    }

    static int Subtraction( int num1, int num2){

        return num1-num2;

    }

    static int Multiplication( int num1, int num2){

        return num1*num2;

    }

}