#include <bits/stdc++.h>

std::vector<int> pow5;
int get(int S, int i) { return (S / pow5[i]) % 5; }
int add(int S, int i) { return S + pow5[i]; }

int main() {
    int n, k;
    std::cin >> n >> k;

    pow5.resize(k + 1, 1);
    for (int i = 1; i <= k; i++)
        pow5[i] = pow5[i - 1] * 5;

    std::vector<int> v(pow5.back(), 0);
    for (int _ : std::ranges::iota_view(0, n)) {
        int x = 0;
        for (int _ : std::ranges::iota_view(0, k)) {
            char c;
            std::cin >> c;
            x = x * 5 + 4 - (c - '0');
        }
        v[x] = 1;
    }

    auto w = v;
    for (int i = 0; i < k; i++)
        for (int S = 0; S < w.size(); S++) {
            if (get(S, i) == 4)
                continue;
            w[add(S, i)] += w[S];
        }

    int res = 0;
    for (int S = 0; S < v.size(); S++)
        res += v[S] and (w[S] > v[S]);
    std::cout << res << '\n';
}