def test_func():
    """Test with given input 1."""
    assert paths_without_crossing(1) == 0
def test_func_negative4():
    """Test negative cases."""
    nose.tools.raises(paths_without_crossing("fdvdfv аррвсв"))
def test_func_negative6():
    """Test negative cases."""
    nose.tools.raises(paths_without_crossing(" "))
def test_func_positive():
    """Test positive cases."""
    nose.tools.assert_equals(paths_without_crossing(8), 14)
    nose.tools.assert_equals(paths_without_crossing(10), 42)