n,k = map(int,input().split())
a = [int(i) for i in input().split()]

num = 2**n
ans = set()

for i in range(num):
    tmp = format(i, '0'+str(n)+'b')
    sm = 0
    sk = 1
    cnt = 0
    for j in range(n):
        if tmp[j] == "1":
            sm += a[j]
            sk *= a[j]
            cnt += 1
    if cnt >= k:
        ans.add(sm)
        ans.add(sk)
        
print(len(ans))