text: import unittest
  import solution
  
  class UnitTests(unittest.TestCase): 
      def test(self):         
  
          self.assertEqual(solution.blocks(1, 1, 2), 5)
          self.assertEqual(solution.blocks(2, 4, 3), 47)
          self.assertEqual(solution.blocks(1, 10, 10), 880)
          self.assertEqual(solution.blocks(20, 30, 40), 83540)
  
  if __name__ == '__main__': 
      unittest.main() 
  