#include <iostream>
#include <vector>
using namespace std;

int main() {
    int b = 0;
    int n;
    cin >> n;
    int k;
    cin >> k;
    vector<int> m(n);
    for (int i = 0; i < n; i++) {
        cin >> m[i];
    }
    for (int i = 0; i < n; i++) {
        if (m[i] >= m[k] && m[i] != 0)
        {
            b++;
        }
    }
    cout << b;
}