N,K=map(int,input().split())
A=list(map(int,input().split()))
ans=[]
for i in range(1<<N):
  cnt=0
  for j in range(N):
    cnt+=(i>>j)&1
  if cnt<K:
    continue
  a=0
  b=1
  for j in range(N):
    if (i>>j)&1:
      a+=A[j]
      b*=A[j]
  ans+=[a,b]
print(len(set(ans)))