def main():
  from sys import stdin
  readline=stdin.readline
  n, k = map(int, readline().split())
  A = list(map(int, readline().split()))
  ans = set()
  for i in range(2**n):
    wa, seki = 0, 1
    cnt = 0
    for j in range(n):
      if (i>>j) & 1:
        cnt += 1
        wa += A[j]
        seki *= A[j]
    if cnt < k:
      continue
    ans.add(wa)
    ans.add(seki)
  print(len(ans))
main()