8, 5, 1, 7, 3, 12, 9, 6
first 8,5 will enter in the node then 1 comes so node will split from the middle and 5 becomes parent and its copy is retained in leaf node at left side . rest process is given in given pic
so ans is 1
note only when a leaf node is split it s copy is retained in leaf node . when an internal node is split then there is no need of copying it as its copy is already in leaf node earlier