def main():
slopes = read_file_to_list("input3.txt")
tree_counts = list()
for x in [1, 3, 5, 7]:
tree_counts.append(move_x_right_1_down(slopes, x))
tree_counts.append(move_1_right_2_down(slopes))
product = multiply(tree_counts)
print(product)
def test_move_x_right_1_down(self):
self.assertEqual(move_x_right_1_down(test_data, 7), 4)