import java.util.*

fun main(A:Array<String>) {
	val s=Scanner(System.`in`)
	val a=s.nextInt()
	val b=s.nextInt()
	val c=s.nextInt()
	val d=s.nextInt()
	val e=s.nextInt()
	val k=s.nextInt()
	println(if(e-a>k) ":(" else "Yay!")
}
