import itertools as iter
import collections as coll
import heapq as hq
import bisect as bis
from decimal import Decimal as dec
from functools import cmp_to_key
import math
import sys
#import pypyjit
#pypyjit.set_param('max_unroll_recursion=-1')
sys.setrecursionlimit(10 ** 6)
inp = sys.stdin.readline
input = lambda : inp().rstrip()
getN = lambda : int(inp())
getNs = lambda : map(int, inp().split())
getList = lambda :list(map(int, inp().split()))
getStrs = lambda n : [input() for _ in [0] * n]
def yexit(): print("Yes"); exit(0)
def nexit(): print("No"); exit(0)
pi = 3.141592653589793
mod = 1000000007
MOD = 998244353
INF = 4611686018427387903
dx = [1, 0, -1, 0];	dy = [0, 1, 0, -1]
#di = coll.defaultdict(int)


"""
Main Code
"""

N, K = getNs()
s = set(getStrs(N))

st = set([])
for ss in s:
	if(ss in st):
		continue
	stk = [ss]
	while(stk):
		v = stk.pop()
		for i in range(K):
			if(v[i] == '0'):
				continue
			nv = ''.join([v[:i], chr(ord(v[i]) - 1), v[i+1:]])
			if(nv in st):
				continue
			st.add(nv)
			stk.append(nv)

print(len(s & st))