from itertools import product
from operator import mul
from functools import reduce

N, K = map(int, input().split())
A = [int(x) for x in input().split()]

s = set()
for p in product([0, 1], repeat=N):
    if list(p).count(1) < K:
        continue
    s.add(sum(A[i] for i in range(N) if p[i]))
    # s.add(reduce((lambda x, y: x * y), (A[i] for i in range(N) if p[i])))
    s.add(reduce(mul, (A[i] for i in range(N) if p[i])))

print(len(s))

z = lambda x, y: x * y