'''
"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.

Input
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 a1, a2, ..., an (0 ≤ ai ≤ 100), where ai 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: ai ≥ ai + 1).

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

Examples
Input
8 5
10 9 8 7 7 7 5 5

Output
6

Input
4 2
0 0 0 0

Output
0

Note
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.
'''

size, kth = map(int, input().split())
score_earned = [int(x) for x in input().split()]
next_round = [x for x in score_earned if (x > 0 and x >= score_earned[kth - 1])]
print(len(next_round))