1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 9, 10, 9, 10, 11, 11, 12, 11, 13, 13, 14, 15, 16, 17, 17, 18, 17, 18, 19, 19, 20, 17, 19, 18, 21, 21, 19, 20, 22, 19, 21, 23, 19, 21, 22, 22, 24, 21, 22, 23, 25, 25, 23, 26, 23, 25, 26, 27, 27, 28, 27, 29, 29, 30, 31, 32, 33, 33