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Title Description

Given an array $a_i$of length $n$, you need to sort it in positive order, search for $k$ after sorting, and output the index of $k$. If this number does not exist, output -1.

Enter description

Enter a total of 2 lines. On the first line, there are two integers $n, k$, with meanings as indicated in the question. On the second line, there are $n$integers $a_i$, with their meanings as indicated in the question.

Output description

One line, one integer, representing the index of $k$.

Example

Sample Group # 1

Input Example

5 4
5 4 3 2 1 

Output Example

4

Sample Group # 2

Input Example

5 14
14 17 15 16 13 

Output Example

2