def popcount(x):
    x -= (x >> 1) & 0x55555555
    x = (x & 0x33333333) + ((x >> 2) & 0x33333333)
    x = (x + (x >> 4)) & 0x0f0f0f0f
    x += x >> 8
    x += x >> 16
    return x & 0x3f

N, K = map(int, input().split())
A = [int(a) for a in input().split()]
S = set()
for i in range(1 << N):
    if popcount(i) < K: continue
    s = 0
    t = 1
    for j, a in enumerate(A):
        if i >> j & 1:
            s += a
            t *= a
    S.add(s)
    S.add(t)
print(len(S))