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 Fortran (gfortran v4.8.4) (judge verdict: Accepted)

module ABC123

  ! <module>s to import
  use, intrinsic :: iso_fortran_env

  ! require all variables to be explicitly declared
  implicit none

  ! accessibility of <subroutine>s and <function>s in this <module>
  public :: ABC123_A

  ! constants for this <module>
  character(len=4, kind=1), parameter, private :: string_communicatable     = 'Yay!'
  character(len=2, kind=1), parameter, private :: string_NOT_communicatable = ':('
  integer  (kind=INT8),     parameter, private :: num_antenna               = 5_INT8

  ! contained <subroutine>s and <function>s are below
  contains

  subroutine ABC123_A

    ! variables for this <subroutine>
    integer(kind=INT8) :: coordinate_A, coordinate_E
    integer(kind=INT8) :: distance_max

    ! support variables for this <subroutine>
    integer(kind=INT8) :: itr

    ! STEP.01
    ! read out the coordinate of the antennas
    read(unit=INPUT_UNIT, fmt='(I3)') coordinate_A

    do itr = 2_INT8, num_antenna, 1_INT8
      read(unit=INPUT_UNIT, fmt='(I3)') coordinate_E
    end do

    ! STEP.02
    ! read out the maximum communicatable distance
    read(unit=INPUT_UNIT, fmt='(I3)') distance_max

    ! STEP.03
    ! judge the distance among the antennas
    if ( coordinate_E - coordinate_A .gt. distance_max ) then
      write(unit=OUTPUT_UNIT, fmt='(A)', advance='yes') string_NOT_communicatable
    else
      write(unit=OUTPUT_UNIT, fmt='(A)', advance='yes') string_communicatable
    end if

    ! STEP.END
    return

  end subroutine ABC123_A

end module ABC123

program main

  ! <module>s to import
  use, non_intrinsic :: ABC123

  ! require all variables to be explicitly declared
  implicit none

  call ABC123_A

end program main