#include<cstdio>
#include<iostream>
using namespace std;
int a[100][100];
int d[100][100];
int dx[8] = { 0,0,-1,1,-1,1,1,-1 };
int dy[8] = { -1,1,0,0,-1,1,-1,1 };
void dfs(int x, int y) {
	d[x][y] = 1;
	for (int k = 0; k < 8; k++) {
		int nx = x + dx[k];
		int ny = y + dy[k];
 
		if (nx >= 0 && nx < 50 && ny >= 0 && ny < 50) {
			if (d[nx][ny] == 0 && a[nx][ny] == 1) {
				dfs(nx, ny);
			}
		}
	}
 
}
int main() {
	while (1) {
		int w = 0;
		int h = 0;
		cin >> w >> h;
		if (w == 0 && h == 0) {
			break;
		}
 
		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				cin >> a[i][j];
			}
		}
		int cnt = 0;
		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				if (d[i][j] == 0 && a[i][j] == 1) {
					dfs(i,j);
					cnt = cnt +1;
				}
			}
		}
		cout << cnt << endl;
 
	}
	return 0;
}

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MSAxCjAKMiAyCjAgMQoxIDAKMyAyCjEgMSAxCjEgMSAxCjUgNAoxIDAgMSAwIDAKMSAwIDAgMCAwCjEgMCAxIDAgMQoxIDAgMCAxIDAKNSA0CjEgMSAxIDAgMQoxIDAgMSAwIDEKMSAwIDEgMCAxCjEgMCAxIDEgMQo1IDUKMSAwIDEgMCAxCjAgMCAwIDAgMAoxIDAgMSAwIDEKMCAwIDAgMCAwCjEgMCAxIDAgMQowIDAK

1 1
0
2 2
0 1
1 0
3 2
1 1 1
1 1 1
5 4
1 0 1 0 0
1 0 0 0 0
1 0 1 0 1
1 0 0 1 0
5 4
1 1 1 0 1
1 0 1 0 1
1 0 1 0 1
1 0 1 1 1
5 5
1 0 1 0 1
0 0 0 0 0
1 0 1 0 1
0 0 0 0 0
1 0 1 0 1
0 0