N,K = map(int,input().split())
A = list(map(int,input().split()))

def popcnt(x):
    res = 0
    while x:
        res += x & 1
        x >>= 1
    return res
    
ans = set()
for status in range(1 << N):
    if popcnt(status) < K:
        continue
    s = 0
    m = 1
    for i in range(N):
        if (status >> i) & 1:
            s += A[i]
            m *= A[i]
    ans.add(s)
    ans.add(m)

print(len(ans))