n, k = map(int, input().split())
a_list = list(map(int, input().split()))

num_set = set()

for i in range(2**n):
    sum_a = 0
    if bin(i).count("1") >= k:

        for j in range(n):
            if i >> j & 1:
                sum_a += a_list[j]

    num_set.add(sum_a)

for i in range(2**n):
    kakeru_a = 1
    if bin(i).count("1") >= k:

        for j in range(n):
            if i >> j & 1:
                kakeru_a = kakeru_a * a_list[j]

    num_set.add(kakeru_a)
num_set.remove(0)
num_set.remove(1)

print(len(num_set))