public static void main(String[] args) {
    // TODO Auto-generated method stub

    Scanner in = new Scanner(System.in);
    int n = in.nextInt();
    in.nextLine();
    int effort = 0, temp;
    int pos = in.nextInt();
    in.nextLine();
    int[] arr = new int[n];
    for (int i = 0; i < n; i++) {
        arr[i] = in.nextInt();
    }

    int p = findlargest(arr);
    for (int i = 0; i < n; i++) {
        for (int j = 1; j < n; j++) {
            if (arr[i] > arr[j]) {
                if (p != i || p != j) {
                    effort += (arr[i] * arr[j]);
                    temp = arr[i];
                    arr[i] = arr[j];
                    arr[j] = temp;
                }
            }
        }
    }


}

public static int findlargest(int[] arr) {
    int max = arr[0];
    int pos = 0;
    for (int i = 1; i < arr.length; i++) {

        if (arr[i] > max) {
            max = arr[i];
            pos = i;
        }

    }
    return (pos);

}