Option Strict On
Module Module1

    Sub Main()
        Dim a As Integer = Convert.ToInt32(Console.ReadLine())
        Dim b As Integer = Convert.ToInt32(Console.ReadLine())
        Dim c As Integer = Convert.ToInt32(Console.ReadLine())
        Dim d As Integer = Convert.ToInt32(Console.ReadLine())
        Dim e As Integer = Convert.ToInt32(Console.ReadLine())
        Dim k As Integer = Convert.ToInt32(Console.ReadLine())
        If e - a > k Then
            Console.WriteLine(":(")
        Else
            Console.WriteLine("Yay!")
        End If
        Console.ReadLine()
    End Sub

End Module