class Program
    {
        static void Main(string[] args)
        {
            string[] nk = Console.ReadLine().Split(' ');
            string[] scoreStr = Console.ReadLine().Split(' ');
            int[] scoreList = new int[401];
            for (int i = 0; i < int.Parse(nk[0]); i++)
            {
                scoreList[int.Parse(scoreStr[i])]++;
            }
            int borderScore = int.Parse(scoreStr[int.Parse(nk[1])-1]);
            int capacity = int.Parse(nk[1]);
            int count = 0;
            Array.Reverse(scoreList);
            for (int i = 0; i < 401; i++)
            {
                if (scoreList[i] == 0)
                {
                    continue;
                }
                if(count + scoreList[i] <= capacity && borderScore <= 400 - i)
                {
                    count += scoreList[i];
                }
                else
                {
                    break;
                }
            }
            Console.WriteLine(count);
        }
    }