!> This file was processed by `fypp`.
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program f902938
  use, intrinsic :: iso_fortran_env
  !> auto use module
  implicit none
  integer(int32), parameter :: max_a = 500
  integer(int32) :: n
  integer(int32), allocatable :: arr(:)
  integer(int64) :: idx_sums(max_a), cnts(max_a)
  integer(int64) :: ans
  integer(int32) :: i, v
  read(input_unit, *) n
  allocate(arr(n))
  read(input_unit, *) arr(:)
  idx_sums(:) = 0_int64
  cnts(:) = 0_int64
  ans = 0_int64
  !> 2 * Σ_{i = 1}^{n}Σ_{j = i + 1}^{n}(...) == Σ_{i = 1}^{n}Σ_{j = 1}^{n}(...)
  do i = 1, n
     associate(idx => n - i)
       do v = 1, max_a
          ans = ans + (idx_sums(v) - cnts(v) * idx) * abs(v - arr(i))
       end do
       idx_sums(arr(i)) = idx_sums(arr(i)) + idx
       cnts(arr(i)) = cnts(arr(i)) + 1
     end associate
  end do
  write(output_unit, '(i0)') 2 * ans
end program f902938