text: const { solution, defaultInput } = require('./');
  
  test('Provided test cases', () => {
  
  });
  
  test('Custom test cases', () => {
      expect(solution('-1')).toBeUndefined();
      expect(solution('0')).toBeUndefined();
      expect(solution('291')).toBeUndefined();
      expect(solution('292')).toBe(291);
      expect(solution('1e13')).toBe(9997908420679);
  });
  
  test('Problem input', () => {
      expect(solution(defaultInput)).toBe(8319823);
  });
  