n,k = map(int,input().split())
a = {tuple(map(int,input())) for _ in range(n)}
d = {}
for i in range(5**k):
    t = []
    for _ in range(k): t.append(i%5); i //= 5
    t = tuple(t); f = False
    for j in range(k):
        if t[j]:
            u = list(t); u[j] -= 1; u = tuple(u)
            f |= u in a or d[u]
    d[t] = f
ans = 0
for s in a: ans += d[s]
print(ans)