Module _20190421

    Sub Main()

        Dim iAntenaA As Integer = Console.ReadLine()
        Dim iAntenaB As Integer = Console.ReadLine()
        Dim iAntenaC As Integer = Console.ReadLine()
        Dim iAntenaD As Integer = Console.ReadLine()
        Dim iAntenaE As Integer = Console.ReadLine()
        Dim iDistance As Integer = Console.ReadLine()

        If iAntenaB - iAntenaA > iDistance OrElse iAntenaC - iAntenaB > iDistance OrElse iAntenaD - iAntenaC > iDistance OrElse iAntenaE - iAntenaD > iDistance Then

            Console.WriteLine(":(")

        Else

            Console.WriteLine("Yay!")

        End If

    End Sub

End Module