import java.util.*;
import java.io.*;
public class Main{
	public static void main(String[] args)
	{
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		int k=sc.nextInt();
		int arr[]=new int[n];
		int sum=0;
		if(n<k)
		{
			System.out.println(-1);
		}
	    for(int i=0;i<n;i++)
	    {
	    	arr[i]=sc.nextInt();
	    }
	    Arrays.sort(arr);
	    for(int i=0;i<k;i++)
	    {
	    	sum=sum+arr[i];
	    }
	    System.out.println(sum);
		
	}

}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz