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

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