B'The legend of the foundation of Vectorland talks of two integers x and y . Centuries ago, the array king placed two markers at points |x| and |y| on the number line and conquered all the land in between (including the endpoints), which he declared to be Arrayland. Many years later, the vector king placed markers at points |x - y| and |x + y| and conquered all the land in between (including the endpoints), which he declared to be Vectorland. He did so in such a way that the land of Arrayland was completely inside (including the endpoints) the land of Vectorland. Here |z| denotes the absolute value of z . Now, Jose is stuck on a question of his history exam: "What are the values of x and y ?" Jose doesn 't know the answer, but he believes he has narrowed the possible answers down to n integers a_1, a_2, ... , a_n . Now, he wants to know the number of unordered pairs formed by two different elements from these n integers such that the legend could be true if x and y were equal to these two values. Note that it is possible that Jose is wrong, and that no pairs could possibly make the legend true. The first line contains a single integer n ( 2 <= n <= 2 cdot 10^5 ) -- the number of choices. The second line contains n pairwise distinct integers a_1, a_2, ... , a_n ( -10^9 <= a_i <= 10^9 ) -- the choices Jose is considering. Print a single integer number -- the number of unordered pairs {x, y } formed by different numbers from Jose 's choices that could make the legend true. Consider the first sample. For the pair {2, 5 } , the situation looks as follows, with the Arrayland markers at |2| = 2 and |5| = 5 , while the Vectorland markers are located at |2 - 5| = 3 and |2 + 5| = 7 : The legend is not true in this case, because the interval [2, 3] is not conquered by Vectorland. For the pair {5, -3 }$$'...