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C. Subsequences

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputFor the given sequence with *n* different elements find the number of increasing subsequences with *k* + 1 elements. It is guaranteed that the answer is not greater than 8·10^{18}.

Input

First line contain two integer values *n* and *k* (1 ≤ *n* ≤ 10^{5}, 0 ≤ *k* ≤ 10) — the length of sequence and the number of elements in increasing subsequences.

Next *n* lines contains one integer *a* _{ i} (1 ≤ *a* _{ i} ≤ *n*) each — elements of sequence. All values *a* _{ i} are different.

Output

Print one integer — the answer to the problem.

Examples

Input

5 2

1

2

3

5

4

Output

7

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

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