import java.util.Arrays;

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);

int size = sc.nextInt();

int k = sc.nextInt();

int array[] = new int[size];

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

int sum = 0;

for (int i = 0; i < array.length - k + 1; i++) {
int temp[] = new int[k];

for (int j = 0; j < k; j++) {
temp[j] = array[i + j];
}
Arrays.sort(temp);
sum = sum + ((temp[(k - 1) / 2]));
}

System.out.println(sum);
}
}

도저히 틀린이유를 모르겠네요.. 어떤점이 오류일가요...?