#include<string>

using namespace std;

int main()
{
   	int n,k,cnt = 0,a[100];
   	cin >> n >> k;
   	for (int i = 1 ; i <= n; i++)
   		cin >> a[i];
   	for (int i = 1 ; i <= n ; i++)
	{
		if (a[k]>0 && a[i]>=a[k])
			cnt++;
	}
   	cout << cnt;
    return 0;
}