#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  int k;
  int ctr;
  ctr = 0;
  cin >> n >> k;
  int a[n + 1];
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  for (int i = 1; i <= n; i++) {
    if (a[i] >= a[k] && a[i] > 0) {
      ctr++;
    }
  }
  cout << ctr;
  return 0;
}
