public struct User
        {
           public  string username;
           public  int password;
           public  string mail;

            public User (string u, int p , string m)
                {
                username = u;
                password = p;
                mail = m;
                }


        }
        static void Main(string[] args)
        {
            Console.WriteLine("Введите запрещеный пароль");
            int l = Convert.ToInt32(Console.ReadLine());
            var user1 = new User( "kek", 123, "kek@mail.ru");
            Console.WriteLine(" username: {0}, password: {1}, mail: {2}", "kek", 123, "kek@mail.ru");