import java.util.*;
import java.math.*;

public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int k = sc.nextInt();

    int[] a = new int[n];

    for (int i = 0; i < n; i++) {
      a[i] = sc.nextInt();
    }

    Arrays.sort(a);

    long sum = 0;

    for (int i = n-1; i > n-k-1; i--) {
      if (sum > sum + a[i]) {
        break;
      }
      sum += a[i];
    }

    System.out.println(sum);

  }

}