#yuki1380
n,k=map(int,input().split())
if n==1:
 if k==1:
  print(1)
 else:
  print(0)
 exit()
p=list(map(int,input().split()))
s=sorted(p,reverse=True)
res=k-1
while k>0:
 if s[k]!=s[k-1]:
  print(k)
  exit()
 else:
  k-=1
print(0)