line = gets
line.chomp!
a = line.to_i

line = gets
line.chomp!
b = line.to_i

line = gets
line.chomp!
c = line.to_i

line = gets
line.chomp!
d = line.to_i

line = gets
line.chomp!
e = line.to_i

line = gets
line.chomp!
k = line.to_i

if (e-a <= k)
  print "Yay!"
else
  print ":("
end
