nested try catch, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
      
        public static void Main(string[] args)
        {
            //Your code goes here
            try{
                try{
                int b=5;
                int c=0;
                Console.WriteLine("1");
                    int a=b/c;
                
                }
                catch(Exception ex){
                    throw ex;
                Console.WriteLine("2");
                    
                }
                finally{
                Console.WriteLine("aaa");
                }
            }
            catch{
            Console.WriteLine("3");
            }
            finally{
            Console.WriteLine("4");
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,19 sec, absolute running time: 0,09 sec, cpu time: 0,11 sec, average memory usage: 12 Mb, average nr of threads: 3