n, k = map(int, input().split())
a = list(map(int, input().split()))
st = set()
for bit in range(1 << n):
    if bin(bit).count('1') < k:
        continue
    sm, pr = 0, 1
    for i in range(n):
        if bit >> i & 1:
            sm += a[i]
            pr *= a[i]
    st.add(sm)
    st.add(pr)
print(len(st))