n, k = [int(x) for x in input().split(" ")]

a = [int(x) for x in input().split(" ")]

s = set()

for i in range(1 << n):
    cnt = 0

    sm = 0
    mul = 1

    for j in range(n):
        if i >> j & 1:
            cnt += 1
            sm += a[j]
            mul *= a[j]

    if cnt < k:
        continue

    s.add(sm)
    s.add(mul)

print(len(s))