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

# print(A)
st = set()
for mask in range(1, 1 << N):
    su = 0
    pi = 1
    # print("mask " + str(mask))
    cnt = 0
    for i in range(N):
        if mask >> i & 1:
            su += A[i]
            pi *= A[i]
            cnt += 1
            # print(i, end = ' ')
    # print()
    if cnt >= K:
        st.add(su)
        st.add(pi)

# print(st)
print(len(st))