|Codeforces Round #461 (Div. 2)|
Imp is in a magic forest, where xorangles grow (wut?)
A xorangle of order n is such a non-degenerate triangle, that lengths of its sides are integers not exceeding n, and the xor-sum of the lengths is equal to zero. Imp has to count the number of distinct xorangles of order n to get out of the forest.
Formally, for a given integer n you have to find the number of such triples (a, b, c), that:
The only line contains a single integer n (1 ≤ n ≤ 2500).
Print the number of xorangles of order n.
The only xorangle in the first sample is (3, 5, 6).