34B.java

//https://codeforces.com/problemset/problem/34/B

import java.io.*;
import java.util.*;
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
// import java.util.Scanner; 
import java.util.StringTokenizer; 
  
public class sale
{ 
    static class FastReader 
    { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new
                     InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    } 
  
    public static void main(String[] args) 
    { 
        FastReader s=new FastReader(); 
        int n = s.nextInt();
        int m = s.nextInt();
        int a[] = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = s.nextInt();
        }
        Arrays.sort(a);
        int sum=0;
        int min = Integer.MAX_VALUE;
        if(a[0]>0)System.out.println(0);
        else{
        for (int i = 0; i < m; i++) {
            sum+=a[i];
            if(sum<min){
                min=sum;
            }
        }
        System.out.println(Math.abs(min));
        }
    }
}