def solve():
    N,K=map(int,input().split())
    S=[None]*N
    for i in range(N):
        S[i]=int("4"*K,5)-int(input(),5)

    X=[0]*pow(5,K)
    for i in range(N):
        X[S[i]]+=1

    for d in range(K):
        t=pow(5,d)
        for i in range(pow(5,K)):
            if i//(5*t)==(i+t)//(5*t):
                X[i+t]+=X[i]

    ans=0
    for i in range(N):
        if X[S[i]]>=2:
            ans+=1
    return ans

#==================================================
print(solve())