# 解説のコンセプトから自分でやってみる

N, K = map(int, input().split())
S = []
for i in range(N):
    S.append(input())
S.sort(reverse = True)

from collections import deque
visited = set()
count = 0
for s in S:
    if s in visited:
        continue
    count += 1
    que = deque()
    que.append(s)
    while que:
        current = que.popleft()
        #print('s', s, 'current', current, 'que', que)
        
        for k in range(K):
            if int(current[k]) > 0:
                new = current[:k] + str(int(current[k])-1) + current[k+1:]
                if new not in visited:
                    visited.add(new)
                    que.append(new)
#print(count)

ans = N - count
print(ans)