import collections as c
n,k = map(int,input().split())
p = list(map(int,input().split()))
ans = 0
for i in reversed(range(0,max(p))):
    b = i
    cnt = 0
    for j in range(n):
        if p[j]>=b:
            cnt += 1
    if cnt<=k:
        ans = max(ans,cnt)
    else:
        break
print(ans)