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

ys = set()
for b in range(1 << n):
    if bin(b).count('1') < k:
        continue

    s, p = 0, 1
    for i in range(n):
        if (~b >> i) & 1:
            continue
        s += xs[i]
        p *= xs[i]
    ys.add(s)
    ys.add(p)

print(len(ys))