1, 10, 11, 12, 13, 14, 15, 16, 18, 2, 20, 21, 22, 24, 26, 28, 3, 30, 32, 34, 36, 38, 4, 40, 42, 44, 45, 46, 47, 48, 5, 50, 51, 52, 53, 6, 7, 8, 9