import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

n, k = na()
s = [int(input()) for j in range(n)]
se = set(s)
ans = len(s)-len(se)

from collections import *
d = defaultdict(int)

def saiki(p, now):
    global ans
    #print(p, now)
    if p == k:
        for i in range(5):
            if (now//(10**i))%(10**(i+1)):
                d[now] |= d[now-10**i]
        if now in se:
            ans += d[now]
            d[now] = 1
        return
    for i in range(5):
        saiki(p+1, now * 10 + i)

saiki(0,0)
print(ans)