// ConsoleApplication3.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <algorithm>
using namespace std;
string a[1001];
bool s[1001] = { 0 };
int main()
{
	int cnt = 0, ss=0, ans = 0;
	
	int n, m;
	cin >> n >> m;
	for (int i = 0; i < n; i++)
			cin >> a[i];

	for (int j = 0; j < m; j++) {
		cnt = 0;
		ss = 0;
		for (int i = 0; i < n; i++) {
			//cout << a[i][j];
			if (a[i][j]=='1') {
				cnt++;
				ss = i;

			}
		}
		//cout << cnt << endl;
		if (cnt == 1 && !s[ss]) {
			ans++;
			s[ss] = true;
		}
		
	}
	cout << ans;
	return 0;
}




// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file