N,K = map(int,input().split())
A = list(map(int,input().split()))
ansSet = set()
for b in range(2**N):
    bit = bin(b)[2:].zfill(N)
    if bit.count('1') < K:
        continue
    s,x = 0,1
    for i in range(len(bit)):
        if bit[i] == '1':
            s += A[i]
            x *= A[i]
    ansSet.add(s)
    ansSet.add(x)
ansList = list(ansSet)
print(len(ansList))