n,k=list(map(int, input().split()))
a=list(map(int, input().split()))
b=set()
for i in range((1<<k)-1,(1<<n)):
    al=0
    cnt=0
    pro=1
    for j in range(0, n):
        if i & (1 << j):
            al+=a[j]
            pro*=a[j]
            cnt+=1
        
    if cnt >= k:
        b.add(al)
        b.add(pro)
print(len(b))