mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    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)


if __name__ == '__main__':
    main()