1, 2, 3, 5, 4, 6, 7, 8, 9, 10, 11, 13, 12, 14, 15, 17, 16, 19, 18, 21, 20, 22, 23, 25, 27, 24, 26, 29, 28, 30, 31, 32, 33, 34, 35, 37, 36, 38, 39, 40, 41, 42, 43, 45, 47, 44, 46, 49, 51, 53, 48, 55, 50, 52, 54, 56, 57, 58, 59, 61, 60, 62, 63, 65, 64, 66, 67, 69, 68, 70, 71, 73