class Program
    {
        static void Main(string[] args)
        {
            int[] nk = Array.ConvertAll(Console.ReadLine().Split(' '), num => int.Parse(num));
            int[] pinList = Array.ConvertAll(Console.ReadLine().Split(' '), num => int.Parse(num));
            Console.WriteLine(nk[0] / 2 + 1);
        }
    }