[1,2,4,4,7,7,7,7,8,8,8,8,12,12,12,12,12,12,12,13, 13,13,13,13,13,13,14,14,14,14,14,14,14,15,15,15, 15,15,15,15,17,17,17,17,17,17,17,17,18,18,18,18, 18,18,18,18,19,19,19,19,19,19,19,19,20,20,20,20, 20,20,20,20]