sum_missing_numbers([4, 3, 8, 1, 2]) ➞ 18

sum_missing_numbers([17, 16, 15, 10, 11, 12]) ➞ 27

sum_missing_numbers([1, 2, 3, 4, 5]) ➞ 0

self.assertEqual(sum_missing_numbers([4, 3, 8, 1, 2]), 18)
self.assertEqual(sum_missing_numbers([17, 16, 15, 10, 11, 12]), 27)
self.assertEqual(sum_missing_numbers([1, 2, 3, 4, 5]), 0)

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