N, K = [int(x) for x in input().split()]
results = [int(x) for x in input().split()]

passer = []
for b in range(1, 10000):
    counter = 0
    for x in results:
        if x >= b:
            counter += 1
    passer.append(counter)

# print(passer)
passer = [x for x in passer if x <= K]
# print(passer)
if not passer:
    print(0)
# elif set(passer) == {0}:
#     print(K)
else:
    print(max(passer))