program main
  implicit none
 
1 format(':(')
2 format('Yay!')
 
  integer a, b, c, d, e, k
  
  read(*,*) a
  read(*,*) b
  read(*,*) c
  read(*,*) d
  read(*,*) e
  read(*,*) k
  
  if (e - a > k) then 
    write(*,1)
  else
    write(*,2)
  end if
  
end program main