#include <bits/stdc++.h>
using namespace std;
using namespace chrono;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif

int main() {
    int64_t n, k;
    cin >> n >> k;
    vector<int64_t> as(n);
    for (auto &&a : as) {
        cin >> a;
    }

    ranges::sort(as);
    ranges::reverse(as);

    int64_t ans = as[0];
    for (int64_t i = 1; i < k; i++) {
        ans += max<int64_t>(0, as[i]);
    }

    cout << ans << endl;

    return 0;
}