#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(),x.end()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
template<class T> inline bool chmax(T&a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T> inline bool chmin(T&a,T b){if(a>b){a=b;return 1;}return 0;}
using ll = long long;

int n,k,ans;
int a[100005];

int main(){
    ios::sync_with_stdio(false); 
    cin.tie(0);

    cin >> n >> k;
    rep(i,n) cin >> a[i];
    sort(a,a+n);
    rep(i,k)if(a[n-1-i]>0 || !i) ans+=a[n-1-i];
    cout << ans << endl;
}