n,k = map(int,input().split())
A = list(map(int,input().split()))
s = set()

for i in range(1<<n):
    if bin(i).count("1") < k:
        continue
    a = 0
    b = 1
    for j in range(n):
        if i >> j & 1:
            a += A[j]
            b *= A[j]
    s.add(a)
    s.add(b)
print(len(s))