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

int main(){
    int n,k;
    cin >> n >> k;
    int ans = 0;
    bool maina = false;
    vector<int> a(n,0) ;
    
    for(int i=0;i<n;i++){
        cin >> a[i];
    }
    
    sort (a.begin(),a.end());
    reverse (a.begin(),a.end());
    
    if(a[0]<0) maina = true;
    
    if(maina) cout << a[0] << endl;
    else{
        for(int i=0;i<k;i++){
            if(a[i]>0) ans += a[i];
        }
        
        cout << ans << endl;
    }
}