#include <bits/stdc++.h>

using namespace std;
int main() {
    int n, k;
    cin >> n >> k;
    vector<int> a(n);

    for (auto &i: a) {
        cin >> i;
    }
    
    sort(a.begin(), a.end());
    reverse(a.begin(), a.end());

    int ans = a[0];
    for (int i = 1; i < n; ++i) {
        if (i < k-1 && a[i] > 0)
            ans += a[i];
    }
    
    cout << ans << endl;
}