text: # This program draws design using repeated lines.
  import turtle
  
  # Constants
  START_X = -200          # Starting X coordinate
  START_Y = 0             # Starting Y coordinate
  LINE_LENGTH = 400       # Length of each line
  ANIMATION_SPEED = 10     # Animation speed
  BIG_ANGLE = 0           # Angle to be substracted from
  
  # Get number of lines to be drawn as an input from user.
  num_lines = int(
      input('Please enter the number of lines you want in your star: '))
  
  # You should not accept values smaller than 5 and request for a new value until user enters a valid value
  # TODO: input validation
  while num_lines < 5:
      num_lines = int(
          input('Please enter the number of lines you want in your star: '))
  # Fractal formula changes depends on ever or odd number of lines.
  # TODO: find theta
  
  if num_lines % 2 == 0:
      theta = 180 - (360 / num_lines)
  else:
      theta = 180 - (180 / num_lines)
  
  
  # Set initial position of turtle.
  turtle.penup()
  turtle.goto(START_X, START_Y)
  turtle.pendown()
  # Set animation speed.
  turtle.speed(ANIMATION_SPEED)
  
  # TODO: Draw num_lines times lines, with turtle tilted
  # by angle degrees after each line is drawn.
  # Hint: use forward & left functions
  counter = 0
  while counter < num_lines:
      turtle.forward(LINE_LENGTH)
      turtle.left(theta)
      counter += 1
  
  # freeze screen until user exits.
  turtle.done()
  