"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 \ge 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 \le k \le n \le 50) separated by a single space.

The second line contains n space-separated integers a1,a2,...,an (0 \le ai \le 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 \ge ai+1).

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

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.