n,k = map(int,input().split())
a = list(map(int,input().split()))

st = set()

for bit in range(1<<n):
	c = 0
	sum_ = 0
	mul = 1
	for i in range(n):
		if bit>>i&1:
			c += 1
			sum_ += a[i]
			mul *= a[i]
	if c >= k:
		st.add(sum_)
		st.add(mul)

print(len(st))