#include <bits/stdc++.h>
using namespace std;

int main() {
  int n, k;
  vector<int> a;

  cin >> n >> k;
  for (int i = 0; i < n; i++) {
    int x;
    cin >> x;
    a.push_back(x);
  }
  sort(a.begin(), a.end());
  int ans = 0;
  ans += a.back();
  a.pop_back();
  for (int i = 0; i < k - 1; i++) {
    if (a.back() > 0) {
      ans += a.back();
      a.pop_back();
    }
  }
  cout << ans << "\n";
}