import java.util.*;
import java.io.*;
import java.math.BigDecimal;
import java.awt.geom.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;

public class Main{

    static final Reader sc = new Reader();
    static final PrintWriter out = new PrintWriter(System.out,false);

    public static void main(String[] args) throws Exception {
        while(true){
        	int w = sc.nextInt();
        	int h = sc.nextInt();
        	if(w==0 && h==0){
        		break;
        	}
        	int[][] map = new int[h][w];
        	for(int i=0;i<h;i++){
        		for(int j=0;j<w;j++){
        			map[i][j] = sc.nextInt();
        		}
        	}
        	boolean[][] judge = new boolean[h][w];
        	ArrayList<Point> list = new ArrayList<Point>();
        	int[] dx = {-1,-1,0,1,1,1,0,-1};
        	int[] dy = {0,-1,-1,-1,0,1,1,1};
        	int count = 0;
        	for(int i=0;i<h;i++){
        		for(int j=0;j<w;j++){
        			if(map[i][j]==1 && !judge[i][j]){
        				count++;
        				judge[i][j] = true;
        				Point point = new Point(i,j);
        				list.add(point);
        				while(!list.isEmpty()){
        					point = list.get(0);
        					list.remove(0);
        					for(int k=0;k<8;k++){
        						if(point.x==0 && dx[k]==-1){
        							continue;
        						}
        						else if(point.x==h-1 && dx[k]==1){
        							continue;
        						}
        						else if(point.y==0 && dy[k]==-1){
        							continue;
        						}
        						else if(point.y==w-1 && dy[k]==1){
        							continue;
        						}

        						if(map[point.x+dx[k]][point.y+dy[k]]==1 && !judge[point.x+dx[k]][point.y+dy[k]]){
        							Point p = new Point(point.x+dx[k],point.y+dy[k]);
        							list.add(p);
        							judge[p.x][p.y] = true;
        						}
        					}
        				}
        			}
        		}
        	}
        	out.println(count);
        	out.flush();
        }
        sc.close();
        out.close();
    }

    static void trace(Object... o) { System.out.println(Arrays.deepToString(o));}
}

class Point{
	int x;
	int y;
	Point(int x,int y){
		this.x = x;
		this.y = y;
	}
}

class Reader {
    private final InputStream sc;
    private final byte[] buf = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    public Reader() { this(System.in);}
    public Reader(InputStream source) { this.sc = source;}

    private boolean hasNextByte() {
        if (ptr < buflen) return true;
        ptr = 0;
        try{
            buflen = sc

.read(buf);
        }catch (IOException e) {e.printStackTrace();}
        if (buflen <= 0) return false;
        return true;
    }

    private int readByte() { if (hasNextByte()) return buf[ptr++]; else return -1;}

    private boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}

    private void skip() { while(hasNextByte() && !isPrintableChar(buf[ptr])) ptr++;}

    public boolean hasNext() {skip(); return hasNextByte();}

    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        boolean minus = false;
        long num = readByte();

        if(num == '-'){
            num = 0;
            minus = true;
        }else if (num < '0' || '9' < num){
            throw new NumberFormatException();
        }else{
            num -= '0';
        }
        
        while(true){
            int b = readByte();
            if('0' <= b && b <= '9')
                num = num * 10 + (b - '0');
            else if(b == -1 || !isPrintableChar(b))
                return minus ? -num : num;
            else
                throw new NoSuchElementException();
        }
    }

    public int nextInt() {
        long num = nextLong();
        if (num < Integer.MIN_VALUE || Integer.MAX_VALUE < num)
            throw new NumberFormatException();
        return (int)num;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }

    public char nextChar() {
        if (!hasNext()) throw new NoSuchElementException();
        return (char)readByte();
    }

    public String nextLine() {
        while (hasNextByte() && (buf[ptr] == '\n' || buf[ptr] == '\r')) ptr++;
        if (!hasNextByte()) throw new NoSuchElementException();

        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (b != '\n' && b != '\r') {
            sb.appendCodePoint(b);
            b = readByte();
        }

        return sb.toString();
    }

    public int[] nextIntArray(int n) {
        int[] res = new int[n];
        for (int i=0; i<n; i++) res[i] = nextInt();
        return res;
    }

    public char[] nextCharArray(int n) {
        char[] res = new char[n];
        for (int i=0; i<n; i++) res[i] = nextChar();
        return res;
    }

    public void close() {try{ sc.close();}catch(IOException e){ e.printStackTrace();}};
}

Measured memory_bytes: 28476