N, K = list(map(int, input().split()))
p = list(map(int, input().split()))
bkt = [0] * (max(p) + 1)
for i in p:
    bkt[i] += 1
ans = 0
while bkt:
    res = bkt.pop()
    if ans + res > K:
        break
    else:
        ans += res

print(ans)