Please subscribe to the official Codeforces channel in Telegram via the link: https://t.me/codeforces_official.
×

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

C. Geometric Progression

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputPolycarp loves geometric progressions very much. Since he was only three years old, he loves only the progressions of length three. He also has a favorite integer *k* and a sequence *a*, consisting of *n* integers.

He wants to know how many subsequences of length three can be selected from *a*, so that they form a geometric progression with common ratio *k*.

A subsequence of length three is a combination of three such indexes *i*_{1}, *i*_{2}, *i*_{3}, that 1 ≤ *i*_{1} < *i*_{2} < *i*_{3} ≤ *n*. That is, a subsequence of length three are such groups of three elements that are not necessarily consecutive in the sequence, but their indexes are strictly increasing.

A geometric progression with common ratio *k* is a sequence of numbers of the form *b*·*k*^{0}, *b*·*k*^{1}, ..., *b*·*k*^{r - 1}.

Polycarp is only three years old, so he can not calculate this number himself. Help him to do it.

Input

The first line of the input contains two integers, *n* and *k* (1 ≤ *n*, *k* ≤ 2·10^{5}), showing how many numbers Polycarp's sequence has and his favorite number.

The second line contains *n* integers *a*_{1}, *a*_{2}, ..., *a*_{n} ( - 10^{9} ≤ *a*_{i} ≤ 10^{9}) — elements of the sequence.

Output

Output a single number — the number of ways to choose a subsequence of length three, such that it forms a geometric progression with a common ratio *k*.

Examples

Input

5 2

1 1 2 2 4

Output

4

Input

3 1

1 1 1

Output

1

Input

10 3

1 2 6 2 3 6 9 18 3 9

Output

6

Note

In the first sample test the answer is four, as any of the two 1s can be chosen as the first element, the second element can be any of the 2s, and the third element of the subsequence must be equal to 4.

Codeforces (c) Copyright 2010-2018 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Dec/13/2018 05:55:46 (d2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|