#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main()
{
	int n, m;
	cin >> n >> m;

	vector<string> vec;

	for (int i = 0; i < n; i++) {
		string g;
		cin >> g;
		vec.push_back(g);
	}

	vector<bool> sol(n, false);
	for (int i = 0; i < m; i++) {//index
		int counter = 0, ind = -1;
		for (int j = 0; j < n; j++) {//string
			//if(vec[j][i] != vec[j+1][i])
			if (vec[j][i] == '1') {
				counter++;
				ind = j;
			}
		}
		if (counter == 1) {
			sol[ind] = true;
		}
		counter = 0;
	}
	//return 0;
	int ans = 0;
	for (auto i : sol) {
		if (i)
			ans++;
	}
	cout << ans << endl;
	
	return 0;

}