N,K = map(int,input().split())
A = list(map(int,input().split()))

s =set()
for i in range(1 << N):
    ans1 = 0
    ans2 = 1
    count = 0
    for j in range(N):
        mask = 1 << j
        if i & mask:
            count += 1
            ans1 += A[j]
            ans1 *= A[j]
    if count >= K:
        s.add(ans1)
        s.add(ans2)
print(len(s))