n, k = map(int, input().split())
a = list(map(int, input().split()))
res = set()
for i in range(1 << n):
    cnt = 0
    use = []
    for j in range(n):
        if i & (1 << j):
            cnt += 1
            use.append(j)
    if cnt < k:
        continue
    use_size = len(use)
    tmp1 = 0
    tmp2 = 1
    for j in range(use_size):
        tmp1 += a[use[j]]
        tmp2 *= a[use[j]]
    res.add(tmp1)
    res.add(tmp2)

print(len(res))