מחשבון חיבור חיסור כפל חילוק

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

namespace ShacharDaKing
{
    class Program
    {
        static void Main(string[] args)
        {

           Start:
            int a, b;
            char sup;
            Console.WriteLine("Type 1 for Adding Or Type 2 For Multiplier Or Type 3 For Dividing Or Type 4 For Removing");
            sup = char.Parse(Console.ReadLine());
            if (sup == '1')
            {
                Console.WriteLine("Type 2 Numbers");
                a = int.Parse(Console.ReadLine());
                b = int.Parse(Console.ReadLine());
                Console.WriteLine(a + b);
            }
            else if (sup == '2')
            {
                Console.WriteLine("Type 2 Numbers");
                a = int.Parse(Console.ReadLine());
                b = int.Parse(Console.ReadLine());
                Console.WriteLine(a * b);
            }
            else if (sup == '3')
            {
                Console.WriteLine("Type 2 Numbers");
                a = int.Parse(Console.ReadLine());
                b = int.Parse(Console.ReadLine());
                Console.WriteLine(a / b);
            }
            else if (sup == '4')
            {
                Console.WriteLine("Type 2 Numbers");
                a = int.Parse(Console.ReadLine());
                b = int.Parse(Console.ReadLine());
                Console.WriteLine(a - b);
            }
            else
                Console.WriteLine("You didnt type the required options");
            Console.ReadLine();
            goto Start;
        }

    }
}