import java.io.IOException;
import java.io.InputStream;
import java.util.*;

public class Main {

    static void dfs(int h, int w) {
        if (grid[h][w] == 0) return;
        grid[h][w] = 0;

        for (int i = -1; i <= 1; ++i) {
            for (int j = -1; j <= 1; ++j) {
                int nh = h + i;
                int nw = w + j;

                if (nh < 0 || nh >= H || nw < 0 || nw >= W) continue;
                if (grid[nh][nw] == 0) continue;
                dfs(nh, nw);
            }
        }
    }

    static int W, H;
    static int[][] grid;

    public static void main(String[] args) {
        FastScanner fs = new FastScanner();
        while (true) {
            W = fs.nextInt();
            H = fs.nextInt();
            if (W == 0 && H == 0) break;
            grid = new int[H][W];
            for (int i = 0; i < H; ++i) {
                for (int j = 0; j < W; ++j) {
                    grid[i][j] = fs.nextInt();
                }
            }

            int cnt = 0;
            for (int i = 0; i < H; ++i) {
                for (int j = 0; j < W; ++j) {
                    if (grid[i][j] != 0) {
                        dfs(i, j);
                        ++cnt;
                    }
                }
            }

            System.out.println(cnt);
        }
    }
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; 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();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

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

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






























Measured memory_bytes: 26708