include

using namespace std;

int nuihaoyu3[305][305] = {0}; int res = 0; int nuihaoyu1, nuihaoyu2;

void nuihaoyu(int i, int j) {

if (i < 0 || j < 0 || i >= nuihaoyu1 || j >= nuihaoyu2) {
	return;
}
if (nuihaoyu3[i][j] == 0) {
	return;
}
nuihaoyu3[i][j] = 0;
nuihaoyu(i + 1, j);
nuihaoyu(i, j + 1);
nuihaoyu(i - 1, j);
nuihaoyu(i, j - 1);

}

int main() {

cin >> nuihaoyu1 >> nuihaoyu2;
for (int i = 0; i < nuihaoyu1; i++) {
	for (int j = 0; j < nuihaoyu2; j++) {
		cin >> nuihaoyu3[i][j];
	}
}
for (int i = 0; i < nuihaoyu1; i++) {
	for (int j = 0; j < nuihaoyu2; j++) {
		if (nuihaoyu3[i][j] == 1) {
			res++;
			nuihaoyu(i, j);
		}
	}
}
cout << res;
return 0;

}