so what is the trick with the test 13? Here is my code:

public static void main(String[] args) {
            Scanner input = new Scanner(System.in);
            int n = input.nextInt();
            int k = input.nextInt();
            long[] arr = new long[k];
            long first = 20000000000000L;
            int first_location = 0;
            long second = 2000000000000L;
            for (int i = 0; i < k; i++)
                arr[i] = input.nextInt();

            for (int i = 0; i < k; i++)
                if (arr[i] < first)
                {
                    first = arr[i];
                    first_location = i;
                }
            arr[first_location] = 0;

            for (int i = 0; i < k; i++)
                if (arr[i] < second && arr[i] != 0)
                    second = arr[i];
            long answer = first + second - n;
            if (answer > 0)
                System.out.println(answer);
            else System.out.println(0);

    }