fun main(args:Array<String>) {
    val a = readLine()!!.toInt()
    val b = readLine()!!.toInt()
    val c = readLine()!!.toInt()
    val d = readLine()!!.toInt()
    val e = readLine()!!.toInt()
    val k = readLine()!!.toInt()

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