using System;

​

public class Program

{

    public static void Main()

    {

        int Number1;

        int Number2;

        string Operation;

        Console.WriteLine("First Number");

        Number1 = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Operation (Plus/Minus/Multiply/Divide)");

        Operation = Console.ReadLine();

        Console.WriteLine("Second Number");

        Number2 = Convert.ToInt32(Console.ReadLine());

        if (Operation == "Plus")

        {

            Console.Write("Equals ");

            Console.WriteLine(Number1+Number2);

        }

        if (Operation == "Minus")

        {

            Console.Write("Equals ");

            Console.WriteLine(Number1-Number2);

        }

        if (Operation == "Multiply")

        {

            Console.Write("Equals ");

            Console.WriteLine(Number1*Number2);

        }

        if (Operation == "Divide")

        {

            Console.Write("Equals ");

            Console.WriteLine(Number1/Number2);

        }

        else

        {

            Console.WriteLine("ERROR: Invalid Syntax!");

        }

    }

}