import scala.io.StdIn
import scala.math._

object Main {
  def main(args: Array[String]): Unit = {
    val a = StdIn.readInt
    REP(3) {_ => StdIn.readInt}
    val e = StdIn.readInt
    val k = StdIn.readInt

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

  def REP(n: Int, offset: Int = 0)(f: Int => Unit): Unit = {
    var i = offset
    val N = n + offset
    while (i < N) { f(i); i += 1 }
  }
}