from functools import lru_cache
n,k = map(int,input().split())
a = {tuple(map(int,input())) for _ in range(n)}
@lru_cache(maxsize=None)
def main(s):
    for i in range(k):
        if s[i]:
            t = list(s); t[i] -= 1; t = tuple(t)
            if t in a or main(t): return True
    return False
ans = 0
for s in a:
    if main(s): ans += 1
print(ans)