def popcount(n):
    cnt = 0
    while n:
        cnt += n & 1
        n //= 2
    return cnt

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

SS = set()
for i in range(1 << N):
    if popcount(i) < K:
        continue
    S = 0
    P = 1
    for j in range(N):
        if (i >> j) & 1:
            S += A[j]
            P *= A[j]
    SS.add(S)
    SS.add(P)
print(len(SS))