import java.util.*;

public class Main {
    
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        
        int n = sc.nextInt();
        int k = sc.nextInt();
        int[] juices = new int[n];
        for(int i = 0 ; i < n ; i++){
            juices[i] = sc.nextInt();
        }
        
        int ans = 0;
        for(int i = 0 ; i < k ; i++){
            int max = -101;
            int index = -1;
            for(int j = 0 ; j < n ; j++){
                if(juices[j] > max){
                    max = juices[j];
                    index = j;
                }
            }   
            if(max <= 0){
                if(i == 0){
                    ans = max;
                }
                break;
            }
            ans += max;
            juices[index] = -101;
        }
      
        System.out.println(ans);
        
    }
    
}