#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k;
  int a[100];
  cin >> n >> k;
  int c = 0;
  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) c++;
  }
  cout << c;
  return 0;
}
