import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Back_4963 {

    static int arr[][];
    static boolean visited[][];
    static int dirX[] = {0, 0, -1, 1, -1, 1, -1, 1};
    static int dirY[] = {-1, 1, 0, 0, 1, 1, -1, -1};

    static int width, height;

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        StringTokenizer st;

        while (true) {
            st = new StringTokenizer(br.readLine());
            width = Integer.parseInt(st.nextToken());
            height = Integer.parseInt(st.nextToken());
            if (width == 0 && height == 0) {
                break;
            } else {

                arr = new int[height][width];
                visited = new boolean[height][width];

                for (int i = 0; i < height; i++) {
                    st = new StringTokenizer(br.readLine());
                    for (int j = 0; j < width; j++) {
                        arr[i][j] = Integer.parseInt(st.nextToken());
                    }
                }

                int count = 0;

                for (int i = 0; i < height; i++) {
                    for (int j = 0; j < width; j++) {

                        if (!visited[i][j] && arr[i][j] == 1) {
                            count++;
                            dfs(i, j);
                        }
                    }
                }
                sb.append(count).append("\n");
            }
        }
        System.out.println(sb);
        br.close();
    }

    private static void dfs(int x, int y) {
        visited[x][y] = true;

        for (int i = 0; i < 8; i++) {
            int nowX = dirX[i] + x;
            int nowY = dirY[i] + y;

            if(nowX >=0 && nowY >=0 && nowX < height && nowY < width && !visited[nowX][nowY] && arr[nowX][nowY] == 1 ){
                dfs(nowX,nowY);
            }
        }
    }

}