Go: package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strconv"
)

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	resolve()
}

func resolve() {
	results := []int{}
	for true {
		w, h := scanInt(sc), scanInt(sc)
		if w == 0 && h == 0 {
			break
		}
		grid := make([][]int, h)
		for i := 0; i < h; i++ {
			grid[i] = make([]int, w)
			for j := 0; j < w; j++ {
				grid[i][j] = scanInt(sc)
			}
		}
		num := 0
		for i := range loop0(h) {
			for j := range loop0(w) {
				start := pos{y: i, x: j}
				if grid[start.y][start.x] == 0 {
					continue
				}
				num++
				_dfs(grid, w, h, start)
			}
		}
		results = append(results, num)
	}
	for _, v := range results {
		fmt.Println(v)
	}
	return
}

func _dfs(grid [][]int, w, h int, start pos) {
	grid[start.y][start.x] = 0
	for _, df := range []pos{
		pos{1, 0}, pos{-1, 0},
		pos{0, -1}, pos{0, 1},
		pos{1, 1}, pos{-1, -1},
		pos{-1, 1}, pos{1, -1},
	} {
		np := addPos(start, df)
		if np.y < 0 || h <= np.y || np.x < 0 || w <= np.x {
			continue
		}
		if grid[np.y][np.x] == 0 {
			continue
		}
		_dfs(grid, w, h, np)
	}
}

type pos struct{ x, y int }

func addPos(p, d pos) pos {
	return pos{
		x: p.x + d.x,
		y: p.y + d.y,
	}
}

func loop0(n int) chan int {
	return loop(0, n-1, 1)
}

func loop1(n int) chan int {
	return loop(1, n, 1)
}

func loop(s, e, d int) chan int {
	ch := make(chan int)
	go func() {
		for i := s; i <= e; i += d {
			ch <- i
		}
		close(ch)
	}()
	return ch
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

C++: #include <iostream>
using namespace std;
#define MAX 50

int map[MAX][MAX];
int ans, w, h;
int dx[] = { 1, 0, -1, 0, 1, 1, -1, -1 };
int dy[] = { 0, 1, 0, -1, -1, 1, 1, -1 };

void dfs(int x, int y) {
	if (x < 0 || x >= w || y < 0 || y >= h) return;
	if (map[y][x]==0) return;
	map[y][x] = 0;
	for (int i=0; i<8; i++)
		dfs(x+dx[i], y+dy[i]);
}

int main() {
	while (cin >> w >> h, w||h) {
		for (int i=0; i<h; i++)
		for (int j=0; j<w; j++)
			cin >> map[i][j];

		ans=0;
		for (int i=0; i<h; i++)
		for (int j=0; j<w; j++)
			if (map[i][j]) { ans++; dfs(j, i); }

		cout << ans << endl;
	}
	return 0;
}

C++: #include<iostream>
#include<stack>
using namespace std;

class P
{
	public:
	int x,y;
	P(int X,int Y)
	{
		x=X;
		y=Y;
	}
};

int main()
{
	int w,h;
	while(cin>>w>>h)
	{
		if(w==0 && h==0)break;
		int ans=0;
		int field[52][52]={0};
		int flg[52][52]={0};

		for(int i=1;i<=h;i++)
		{
			for(int j=1;j<=w;j++)
			{
				cin>>field[i][j];		
			}
		}

		for(int i=1;i<=h;i++)
		{
			for(int j=1;j<=w;j++)
			{
				if(field[i][j]==0 || flg[i][j]==1)continue;
				ans++;
				stack<P> ST;
				ST.push(P(j,i));
				while(!ST.empty())
				{
					int x=ST.top().x;
					int y=ST.top().y;
					ST.pop();
					flg[y][x]=1;
					for(int y2=-1;y2<=1;y2++)
					{
						for(int x2=-1;x2<=1;x2++)
						{
							if(field[y+y2][x+x2]==0 || flg[y+y2][x+x2]==1)continue;
							ST.push(P(x+x2,y+y2));
							flg[y+y2][x+x2]=1;
						}
					}
				}
			}
		}
		cout<<ans<<endl;
	}
	return 0;
}

C++: #include <iostream>
#include <vector>
#include <queue>

using namespace std;

int main(void) {
	int w,h;
	while(cin >> w >> h && w && h) {
		vector< vector<int> > data(w+2,vector<int>(h+2,0));
		vector< vector<bool> > check(w+2,vector<bool>(h+2,false));
		queue<int> sx,sy;
		for (int i = 1; i <= h; ++i) {
			for (int j = 1; j <= w; ++j) {
				cin >> data[i][j];
				if (data[i][j] == 1) {
					sx.push(j);
					sy.push(i);
				}
			}
		}

		int nx,ny;
		int count = 0;
		queue<int> fx,fy;
		while(!sx.empty()) {
			nx = sx.front();
			ny = sy.front();
			sx.pop();
			sy.pop();
			if (!check[ny][nx]) {
				check[ny][nx] = true;
				fx.push(nx);
				fy.push(ny);
				++count;
			}
			while (!fx.empty()) {
				nx = fx.front();
				ny = fy.front();
				fx.pop();
				fy.pop();
				if (!check[ny+1][nx] && data[ny+1][nx] == 1) {
					check[ny+1][nx] = true;
					fx.push(nx);
					fy.push(ny+1);
				}
				if (!check[ny-1][nx] && data[ny-1][nx] == 1) {
					check[ny-1][nx] = true;
					fx.push(nx);
					fy.push(ny-1);
				}
				if (!check[ny+1][nx+1] && data[ny+1][nx+1] == 1) {
					check[ny+1][nx+1] = true;
					fx.push(nx+1);
					fy.push(ny+1);
				}
				if (!check[ny+1][nx-1] && data[ny+1][nx-1] == 1) {
					check[ny+1][nx-1] = true;
					fx.push(nx-1);
					fy.push(ny+1);
				}
				if (!check[ny-1][nx-1] && data[ny-1][nx-1] == 1) {
					check[ny-1][nx-1] = true;
					fx.push(nx-1);
					fy.push(ny-1);
				}
				if (!check[ny-1][nx+1] && data[ny-1][nx+1] == 1) {
					check[ny-1][nx+1] = true;
					fx.push(nx+1);
					fy.push(ny-1);
				}
				if (!check[ny][nx+1] && data[ny][nx+1] == 1) {
					check[ny][nx+1] = true;
					fx.push(nx+1);
					fy.push(ny);
				}
				if (!check[ny][nx-1] && data[ny][nx-1] == 1) {
					check[ny][nx-1] = true;
					fx.push(nx-1);
					fy.push(ny);
				}
			}
		}
		cout << count << endl;
	}
	return 0;
}