|VK Cup 2012 Qualification Round 1|
"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.
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).
Output the number of participants who advance to the next round.
10 9 8 7 7 7 5 5
0 0 0 0
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.