#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int n,k,x;cin>>n>>k;
  vector<int> hoge;
  rep(i,n){
    cin>>x;
    hoge.push_back(x);
  }
  sort(hoge.rbegin(),hoge.rend());
  int ans=hoge[0];
  rep2(i,1,k-1){
    if(hoge[i]>0)ans+=hoge[i];
    else break;
  }
  cout<<ans<<endl;
}