n,k=map(int,input().split())
a=list(map(int,input().split()))
s=set()
for bit in range(1<<n):
  ans1=0
  ans2=1
  count=0
  for i in range(n):
    if bit&(1<<i):
      ans1+=a[i]
      ans2*=a[i]
      count+=1
  if count>=k:
    s.add(ans1)
    s.add(ans2)
print(len(s))