import java.util.Scanner

object Main {
  def main(args: Array[String]): Unit = {
    val sc = new Scanner(System.in)
    val a = sc.nextInt()
    (1 to 3) foreach {x =>
      sc.nextInt()
      ()
    }
    val e = sc.nextInt()
    val k =sc.nextInt()

    if (e - a <= k) println("Yay!") else println(":(")
  }
}
