n, k = map(int, input().split())
a = list(map(int, input().split()))
s = set()
for b in range(1 << n):
    l = []
    for i in range(n):
        if 1 << i & b:
            l.append(a[i])
    if len(l) < k: continue
    su, pr = 0, 1
    for i in l:
        su += i
        pr *= i
    s.add(su)
    s.add(pr)
print(len(s))