Given \(N\) numbers and an integer \(K\) find :

\((N^{maxmed}) mod 1e9+7\)

Formally: we can define \(maxmed\) as the maximum median of each subarray of length \(K\).

Note that: the median of \(K\) numbers indexed from \(1\) is \({((K+1)/2)^{th}}\) smallest of them, rounding down for even \(K\).

Input format

• The first line contains two integers \(N\) and \(K\) denoting the number of elements and size of the subarray.
• The second line contains \(N\) space-separated integers.

Output format

Print the answer as described above.

Constraints

\(2 \le N,K \le 10^5\)

\(1 \le a_i \le 10^5\)

\(K \le N\)