#include <iostream>

using namespace std;
int arr[100];
int main()
{
                int n, se;
                cin >> n >> se;
                for(int i = 0; i < n; ++i)
                {
                                cin >> arr[i];
                }
                int res = 0;
                for (int i = 0; i < n; ++i)
                {
                                if(arr[i] >= arr[se-1] && arr[i] != 0)
                                                ++res;
                }
                cout << res;
                return 0;
}