from collections import deque


N, K = map(int, input().split())
S = [input() for _ in range(N)]
num = dict()
res = [0] * N

for i in range(N):
    n = 0
    for j in range(K):
        n *= 5
        n += 4 - int(S[i][j])
    num[n] = i

if 0 in num:
    print(N - 1)
    exit()

dq = deque()
dq.append((0, 0))
while dq:
    now, t = dq.popleft()
    if now in num:
        if t == 1:
            if res[num[now]]:
                continue
            res[num[now]] = 1
        else:
            t = 1
    a = []
    for i in range(K):
        a.append(now % 5)
        now //= 5
    a.reverse()
    for i in range(K):
        if a[i] == 4:
            continue
        a[i] += 1
        nxt = 0
        for j in range(K):
            nxt *= 5
            nxt += a[j]
        dq.append((nxt, t))
        a[i] -= 1

print(sum(res))