1, 3, 2, 6, 4, 5, 10, 7, 9, 8, 15, 11, 14, 13, 12, 21, 16, 20, 19, 17, 18, 28, 22, 27, 26, 23, 25, 24, 36, 29, 35, 34, 30, 33, 31, 32, 45, 37, 44, 43, 38, 42, 39, 41, 40, 55, 46, 54, 53, 47, 52, 48, 51, 50, 49, 66, 56, 65, 64, 57, 63, 58, 62, 61, 59, 60, 78, 67, 77