object Main extends App {
	    case class Address(street: String, city: String, zipcode: String)
    case class Person(name: String, address: Address)
    case class Account(owner: Person, entries: List[Int])
 
    def balance(a: Account) = a.entries.sum
 
    trait Sum[A] {
      def sum(a: A): Int
    }
 
    def sum[A](a: A)(implicit summer: Sum[A]) = summer.sum(a)
 
    implicit object AccountSum extends Sum[Account] {
      def sum(a: Account): Int = balance(a)
    }
 
    val account = Account(Person("name", Address("streetname", "cityname", "10000")), List(2, 8, 32))
 
    println(sum(account))
}

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