#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#ifndef ONLINE_JUDGE
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
#endif
    int n, m;
    cin >> n >> m;
    set<int> ans;
    vector<string> v(n);
    for (auto &i : v) cin >> i;
    for (int j = 0; j < m; ++j) {
        vector<int> temp;
        for (int i = 0; i < n; ++i) {
            if (v[i][j] == '1') temp.push_back(i);
        }
        if (temp.size() == 1) ans.insert(temp.back());
    }
    cout << ans.size() << '\n';
    return 0;
}