# 完全全探索でO(N x max(pi))

N, K = map(int, input().split())
P = list(map(int, input().split()))

ans = 0
for B in range(401):
    cnt = 0
    for p in P:
        if p >= B:
            cnt += 1
    if cnt <= K:
        ans = max(ans,cnt)

print(ans)