def test_equals(self):
     self.assertEqual(solution(0), 0)
 def test_equals_2(self):
     self.assertEqual(solution(2), 1)
 def test_equals_10(self):
     self.assertEqual(solution(10), 2)
 def test_equals_13(self):
     self.assertEqual(solution(10000), 5)
 def test_equals_8(self):
     self.assertEqual(solution(8), 1)
 def test_equals_9(self):
     self.assertEqual(solution(9), 2)
 def test_equals_7(self):
     self.assertEqual(solution(7), 3)
 def test_equals_6(self):
     self.assertEqual(solution(6), 2)
 def test_equals_5(self):
     self.assertEqual(solution(5), 2)
 def test_equals_4(self):
     self.assertEqual(solution(4), 1)
 def test_equals_3(self):
     self.assertEqual(solution(3), 2)