using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("calculator");

        Console.WriteLine("enter x");

        string x = Console.ReadLine();

        Console.WriteLine("enter operation");

        string op = Console.ReadLine();

        Console.WriteLine("enter y");

        string y = Console.ReadLine();

        int x2 = Int32.Parse(x);

        int y2 = Int32.Parse(y);

        switch(op){

            case "+":

                Console.WriteLine("result:");

                Console.WriteLine(x2 + y2);

                break;

            case "-":

                Console.WriteLine("result:");

                Console.WriteLine(x2 - y2);

                break;

            case "*":

                Console.WriteLine("result:");

                Console.WriteLine(x2 * y2);

                break;

            case "/":

                Console.WriteLine("result:");

                Console.WriteLine(x2 / y2);

                break;

        }

    }

}