import java.util.Scanner

fun main(args: Array<String>) {
  val scanner = Scanner(System.`in`)
  val a = scanner.nextInt()
  scanner.nextInt()
  scanner.nextInt()
  scanner.nextInt()
  val e = scanner.nextInt()
  println(if (e - a <= scanner.nextInt()) "Yay!" else ":(")
  scanner.close()
}