#include <bits/stdc++.h>
using namespace std;
struct point{double x;double y;};
int i,j,k,count1=0,count2=0;

int main(void){
    int n,k;
    cin>>n>>k;
    vector<int> vec(n);
    for(i=0;i<n;i++){
        cin>>vec[i];
    }
    sort(vec.rbegin(),vec.rend());
    int ans=vec[0];
    for(i=1;i<k;i++){
        if(vec[i]>0)ans+=vec[i];
    }
    cout<<ans<<endl;
}