using System;

using System.Threading.Tasks;

public class Program

{

    private static async Task<int> Method4(int p){

            throw new Exception();

    }

    private static  Task<int> Method3(int p){

            return  Method4(p);

    }

    private static   Task<int> Method2(int p){

            return  Method4(p);

    }

    private static async Task<int> Method1(int p){

            if(p == 0)

                return await Method2(p);

            else

                return await Method3(p);

    }

    public async static Task Main()

    {

        try{

            await Method1(0);

        }catch(Exception e){

            Console.WriteLine(e);

        }

        try{

            await Method1(1);

        }catch(Exception e){

            Console.WriteLine(e);

        }

    }

}