object Main {
  def main(args: Array[String]): Unit = {
    val list = readLine().split(" ").toList.map(_.toInt)
    if (list.drop(1).sum == list.head || list.reverse.drop(1).sum == list.reverse.head || list.drop(1).reverse.drop(1).head == list.head + list.reverse.head) println("Yes")
    else println("No")

  }
}
