CF158A.Next Round

普及/提高-

通过率：0%

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题目描述

"Contestant who earns a score equal to or greater than the $k$ -th place finisher's score will advance to the next round, as long as the contestant earns a positive score..." — an excerpt from contest rules.

A total of $n$ participants took part in the contest ( $n>=k$ ), and you already know their scores. Calculate how many participants will advance to the next round.

输入格式

The first line of the input contains two integers $n$ and $k$ ( $1<=k<=n<=50$ ) separated by a single space.

The second line contains $n$ space-separated integers $a_{1},a_{2},...,a_{n}$ ( $0<=a_{i}<=100$ ), where $a_{i}$ is the score earned by the participant who got the $i$ -th place. The given sequence is non-increasing (that is, for all $i$ from $1$ to $n-1$ the following condition is fulfilled: $a_{i}>=a_{i+1}$ ).

输出格式

Output the number of participants who advance to the next round.

输入输出样例

输入#1
```
8 5
10 9 8 7 7 7 5 5
```
输出#1
```
6
```
输入#2
```
4 2
0 0 0 0
```
输出#2
```
0
```

说明/提示

In the first example the participant on the 5th place earned 7 points. As the participant on the 6th place also earned 7 points, there are 6 advancers.

In the second example nobody got a positive score.

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