import scala.math.{min,max}

object Main {
    def main(args: Array[String]) {
        var input = io.Source.stdin.getLines().mkString("\n");
        val xs = input.split('\n').map(_.toInt).toArray;
        // var ss = input.split('\n').toList;
        // val xs = to_array_int(ss(0));
        val k = xs(5);
        var res = xs(4) - xs(0) <= k;
        println(if (res) "Yay!" else ":(");
    }
    def to_array_int(s: String): Array[Int] = {
        return s.split(' ').map(_.toInt).toArray;
    }
}
