using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Nested IFs");

        string username, password;

        Console.WriteLine("Enter your username.");

        username = Console.ReadLine();

        if(username="open")

        {

        Console.WriteLine("Enter your username.");

        password = Console.ReadLine();

        if(password="sesame")

        {

            Console.WriteLine("BOOM!");

        }

            else

                {

            Console.WriteLine("You have entered the wrong password");

                else

                    {

            Console.WriteLine("You have entered the wrong username.");

        }

        }

    }

}