N, K = map(int, input().strip().split())

ai = [int(i) for i in input().split()]

ans = set()
for bits in range(1 << N):
    if bin(bits).count("1") >= K:
        sum = 0
        mul = 1
        for k in range(N):
            if bits & (1 << k):
                sum += ai[k]
                mul *= ai[k]
        
        ans.add(sum)
        ans.add(mul)

print(len(ans))