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

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int k = in.nextInt();
        int[] b = new int[n];
        int min = Integer.MAX_VALUE;
        for (int i=0; i<n; i++) {
            b[i] = in.nextInt();
            min = Math.min(min, b[i]);
        }
        if (k >= n) {
            System.out.println(min);
        } else if (k==0) {
            int sum = 0;
            for (int i=0; i<n; i++) {
                sum += b[i];
            }
            System.out.println(sum);
        } else {
            int step = n / k;
        }
    }
}