Problem:
﻿Score: 100 points

Problem Statement

In AtCoder city, there are five antennas standing in a straight line. They are called Antenna A, B, C, D and E from west to east, and their coordinates are a, b, c, d and e, respectively.

Two antennas can communicate directly if the distance between them is k or less, and they cannot if the distance is greater than k.

Determine if there exists a pair of antennas that cannot communicate directly.

Here, assume that the distance between two antennas at coordinates p and q (p < q) is q - p.

Constraints

a, b, c, d, e and k are integers between 0 and 123 (inclusive).

a < b < c < d < e

Input

Input is given from Standard Input in the following format:

a
b
c
d
e
k

Output

Print :( if there exists a pair of antennas that cannot communicate directly, and print Yay! if there is no such pair.

Sample Input 1

1
2
4
8
9
15

Sample Output 1

Yay!

In this case, there is no pair of antennas that cannot communicate directly, because:

the distance between A and B is 2 - 1 = 1

the distance between A and C is 4 - 1 = 3

the distance between A and D is 8 - 1 = 7

the distance between A and E is 9 - 1 = 8

the distance between B and C is 4 - 2 = 2

the distance between B and D is 8 - 2 = 6

the distance between B and E is 9 - 2 = 7

the distance between C and D is 8 - 4 = 4

the distance between C and E is 9 - 4 = 5

the distance between D and E is 9 - 8 = 1

and none of them is greater than 15. Thus, the correct output is Yay!.

Sample Input 2

15
18
26
35
36
18

Sample Output 2

:(

In this case, the distance between antennas A and D is 35 - 15 = 20 and exceeds 18, so they cannot communicate directly.
Thus, the correct output is :(.

Solution in Julia (0.5.0) (judge verdict: Accepted)

function read_Int64()
	return Base.parse(Base.Int64, Base.readline(Base.STDIN))
end

function abc123_A()

	const num_antennas = 5

	# STEP.01
	# read out the coordinates of the each antenna
	coordinate = Base.Array{Base.Int64}(num_antennas)

	for itr in Base.range(1, 1, num_antennas)
		coordinate[itr] = read_Int64()
	end

	# STEP.02
	# read out the maximum distance to communicate
	distance_max = read_Int64()

	for itr_Lv1 in Base.range(1, 1, num_antennas)
	for itr_Lv2 in Base.range(1, 1, num_antennas)
		if Base.abs(coordinate[itr_Lv2] - coordinate[itr_Lv1]) > distance_max
			return ":("
		else
			continue
		end
	end
	end

	return "Yay!"

end

Base.println(Base.STDOUT, Main.abc123_A())