Calculator

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            //variable
            int choice, formula, number1, number2;

            do
            {
                //give user the choices
                Console.WriteLine("1.Addition Calculator");
                Console.WriteLine("2.Multiplication Calculator");
                Console.WriteLine("3.Exit Calculator");

                //ask user to enter their choices
                Console.Write("What is your choices: ");
                choice = int.Parse(Console.ReadLine());

                if (choice == 1)
                {
                    Console.WriteLine("Please enter 2 numbers: ");
                    number1 = int.Parse(Console.ReadLine());
                    number2 = int.Parse(Console.ReadLine());
                    formula = number1 + number2;
                }else if (choice == 2)
                {
                    Console.WriteLine("Please enter 2 numbers: ");
                    number1 = int.Parse(Console.ReadLine());
                    number2 = int.Parse(Console.ReadLine());
                    formula = number1 * number2;
                }else
                {
                    Console.WriteLine("Noob");
                }
                Console.WriteLine("Your answer is: {0}", formula);

            } while (choice != 3);
        }
    }
}