arr1 = $stdin.gets.chomp.to_i
arr2 = $stdin.gets.chomp.to_i
arr3 = $stdin.gets.chomp.to_i
arr4 = $stdin.gets.chomp.to_i
arr5 = $stdin.gets.chomp.to_i
arr6 = $stdin.gets.chomp.to_i

cond = (arr5[0] - arr4[0] <= arr6[0] and arr4[0] - arr3[0] <= arr6[0] and arr3[0] - arr2[0] <=arr6[0] and arr2[0] - arr1[0] <=arr6[0])

if cond
 puts "Yay!"
else
 puts ":("
end