from itertools import accumulate
from bisect import bisect_left
from collections import Counter


def main():
    n, k = map(int, input().split())
    p = list(map(int, input().split()))
    p.sort(reverse=True)

    c = Counter(p)
    acc = list(accumulate(c.values()))
    print(bisect_left(acc, k))


if __name__ == "__main__":
    main()