n, k = list(map(int, input().split()))
a = list(map(int, input().split()))
b = []
for i in range(0, (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.append(al)
        b.append(pro)
    

print(len(set(b)))