text: import unittest
  
  from phone_prices import phone_prices
  
  class TestPhonePrices(unittest.TestCase):
  
      def test_example(self):
          res = phone_prices([375, 750, 723, 662, 647, 656, 619])
          self.assertEqual(2, res)
  
  if __name__ == '__main__':
  	unittest.main()