from sys import stdin
pin=stdin.readline
def main():
  N,K=map(int,pin().split())
  p=list(map(int,pin().split()))
  for i in range(401):
    cnt=0
    for j in p:
      if j>=i:
        cnt+=1
    if cnt<=K:
      print(cnt)
      return
  print(0)
  return

main()