n, k = map(int, input().split())
a = list(map(int, input().split()))
st = set()
for b in range(1 << n):
    s, m, c = 0, 1, 0
    for j in range(n):
        if b >> j & 1:
            s += a[j]
            m *= a[j]
            c += 1
    if c >= k:
        st.add(s)
        st.add(m)

print(len(st))