Nikita plays a new computer game. There are m levels in this game. In the beginning of each level a new class appears in the game; this class is a child-class of the class y_i (and y_i is called parent-class for this new class). Thus, the classes form a tree. Initially there is only one class with index 1.

Changing the class to its neighbour (child-class or parent-class) in the tree costs 1 coin. You can not change the class back. The cost of changing the class a to the class b is equal to the total cost of class changes on the path from a to b in the class tree.

Suppose that at i -th level the maximum cost of changing one class to another is x

First line contains one integer number m — number of queries (1 ≤ m ≤ 3·10⁵).

Next m lines contain description of queries. i -th line (1 ≤ i ≤ m) describes the i -th level and contains an integer y_i — the index of the parent-class of class with index i + 1 (1 ≤ y_i ≤ i).

Suppose that at i -th level the maximum cost of changing one class to another is x. For each level output the number of classes such that for each of these classes there exists some other class y, and the distance from this class to y is exactly x.

維護重心和點到重心的距離來處理直徑

codeforces 842E. Nikita and game