#include <iostream>
#include <vector>
 
using namespace std;
 
void paint(vector<vector<int> > &a, int i, int j) {
	a[i][j] = 2;
	if (a[i-1][j] == 1) paint(a, i-1, j);
	if (a[i+1][j] == 1) paint(a, i+1, j);
	if (a[i][j-1] == 1) paint(a, i, j-1);
	if (a[i][j+1] == 1) paint(a, i, j+1);
}
 
 
int task(vector<vector<int> > &a) {
	int k = 0;
	for (int i = 1; i < a.size() -1; i++) {
		for (int j = 1; j < a[i].size() -1; j++) {
			if (a[i][j] == 1) {
				k ++;
				paint(a, i, j);
			}	
		}
	}
 
	return k;
}
 
int main() {
	int m, n;
	cin >> m >> n;
 
	vector<vector<int> > a (m+2, vector<int> (n+2, 0));
	for (int i = 1; i <= m; i++) {
		for (int j = 1; j <= n; j++) {
			cin >> a[i][j];
		}
	}
 
	int k = task(a);
 
	cout << k << endl;
 
	return 0;
}

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NCA2CjEgMSAwIDAgMCAxCjEgMCAwIDAgMCAxCjEgMSAxIDAgMCAwIAoxIDEgMSAxIDEgMQ==

4 6
1 1 0 0 0 1
1 0 0 0 0 1
1 1 1 0 0 0 
1 1 1 1 1 1