#! /usr/bin/python3

import unittest

def damm(n):
  tab = [
    [0,3,1,7,5,9,8,6,4,2],
    [7,0,9,2,1,5,4,8,6,3],
    [4,2,0,6,8,7,1,3,5,9],
    [1,7,5,0,9,8,3,4,2,6],
    [6,1,2,3,0,4,5,9,7,8],
    [3,6,7,4,2,0,9,5,8,1],
    [5,8,6,9,7,2,0,1,3,4],
    [8,9,4,5,3,6,2,0,1,7],
    [9,4,3,8,6,1,7,2,0,5],
    [2,5,8,1,4,3,6,7,9,0]
  ]
  c = 0
  for digit in str(n):
    dd = int(digit)
    c = tab[c][dd]
  return c

def checkdamm(n):
  if damm(n) == 0:
    return True
  else:
    return False

class TestDamm(unittest.TestCase):

        def test_ex1(self):
          self.assertEqual(checkdamm(5724),
                           True,
                           'example 1')

        def test_ex2(self):
          self.assertEqual(checkdamm(5727),
                           False,
                           'example 2')
 
unittest.main()