begin
  integer a, b, c, d

  ! With variables
  a = b * c + d
  a = (b * c) + d

  a = b + c * d
  a = b + (c * d)

  ! With constants
  a = 2 * 3 + 4
  a = (2 * 3) + 4

  a = 2 + 3 * 4
  a = 2 + (3 * 4)

endofprogram