CF158A.Next Round

"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.

“得分不低于第 k 名选手得分的参赛者将晋级下一轮，前提是该参赛者的得分必须为正数……”——摘自比赛规则。

共有 n 名参赛者参加了本次比赛（n ≥ k），且你已知所有人的得分。请计算有多少名参赛者将晋级下一轮。

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).

输入的第一行包含两个整数 $n$ 和 $k$（$1 ≤ k ≤ n ≤ 50$），以单个空格分隔。

第二行包含 $n$ 个以空格分隔的整数 $a_1,\,a_2,\,...,\,a_n$（$0 ≤ a_i ≤ 100$），其中 $a_i$ 表示获得第 $i$ 名的参赛者的得分。给定的序列是非递增的（即，对所有从 $1$ 到 $n-1$ 的 $i$，均满足 $a_i ≥ a_{i+1}$）。

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

输出晋级下一轮的参赛者人数。

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.

在第一个例子中，第 5 名的参赛者获得了 7 分。由于第 6 名的参赛者也获得了 7 分，因此共有 6 名晋级者。

在第二个例子中，没有人获得正分。